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Old 10-29-2000, 07:18 PM   #1
tomrichardson
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Post JC Sports intake and exhaust review

I had a completely stock setup until I bought the JC Sports intake and exhaust. I have to say, both items are well worth the cost!!

The intake was very easy to install. I just completely removed the whole stock intake system all the way up to the throttle body. The intake fit right in and lined up with the bar that holds it. The stock airbox has two bars that hold it in, I simply removed the one on the left side. Just two bolts for that one. The silicon adapter to the throttle body had to be muscled on, but I got it. I had to buy an extra hose extension for the center hose. It barely made it. I bought extra clamps for the two hose extensions (one extension came with the kit for the left hose). I also bought an extra clamp for the filter. All in all, the intake was simple to install, and it looks good.

The exhaust was easier to install than the intake. The exhaust came with all the parts needed and fit right in. It hung on the appropriate rubber hangers perfectly. Now, this is a 2.5 inch aluminized tube. The stock tube is only 2.25 inch. A quarter inch in diameter on a pipe is a very big increase. Just think about area. With a 2.25 inch pipe the area of a given slice is (pi * (1.125)^2) = 3.976 inch squared. With a 2.5 inch pipe at a given slice is (pi * (1.25)^2) = 4.9087 inch squared. That's almost a whole INCH difference in area. Now think volume. The length of the pipe MULTIPLIED by the area of a given slice (not taking into account mendrel bends) is A LOT of extra space for air to flow though! This exhaust also has a 2 inch pipe out of the canister that grows to 4 inches at the end. That creates good back pressure! Plus people behind you REALLY notice your exhaust because it's so big! This exhaust is also loud. I got the non-resinated version, so it is pretty loud. But it has a deep sound to it. Not like those whiny Honda exhausts!

As far as performance improvement - I was very impressed. I did a 0-60 run on the stock car in about 12 seconds. After the new intake and exhaust, I can do 0-60 runs in the high 8's and low 9's depending on how well I get off the line.

I would recommend this intake and exhaust setup for everybody because of ease of install (totally bolt on) and the ammount of performance increase.

The price was fairly good, too. $450 for the whole exhaust. $174.95 for the intake. Not bad considering the intake comes with a re-usable K&N-like high flow filter!

Tom Richardson, Jr.
Hailey, ID
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Old 10-29-2000, 07:43 PM   #2
SIRS
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O-60 in 12 seconds??? Are you starting in third?? That doesn't sound right.
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Old 10-29-2000, 07:46 PM   #3
bluesube
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excuse me- the intake and exhaust install gained you 3 sec. in 0-60?? You must be referring to a 1/4 mil run; if you are doing a 0-60 in 12 sec you must be running on 3 cylinders... Why are folks buying turbos then? Please check/post your numbers for this. I just installed a WRX Sti exhaust and will soon be installing a JC Sport intake with cold air adaptor. The combination will give maybe 20 hp increase, probably more than your install due to a true cold air intake system, but will not give me that much of a quarter mile run increase. Or are you basing this on a "butt dyno"? No question that anaftermarket exhaust and intake do make a big difference- that is half the fun of installing theswe things!
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Old 10-29-2000, 08:01 PM   #4
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None of my numbers are official or dyno numbers. They'll all rough numbers based on stop watch. No, I am not referring to quarter mile runs and I am not starting in third (who would?)

Keep in mind that I do not have ANY other engine mods. No ud pulley, no header either. I simply have the new intake and exhaust and mobil 1 synthetic oil. I did a few 0-60 runs with the stock setup in low 11's and high 10's, but most of them were in high 11's and low 12's. Remember, THESE ARE ROUGH. The JC Sports intake and exhaust put out a lot of low-end power, not high end power, so I thought a 0-60 run comparison would be appropriate for the setup.

If you want, I'll do a 1/4 mile run and post my numbers.

Anyways, thanks for the input.

Tom

Also keep in mind (i know i didn't mention this) that I am not going beyond red line when accelerating. Those numbers are shifting at red line. So that's using 3 gear at 60, not 2nd gear.

[This message has been edited by tomrichardson (edited October 29, 2000).]
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Old 10-29-2000, 08:05 PM   #5
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Tom-

Do you have an RS, or an older L?

Jim
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Old 10-29-2000, 08:08 PM   #6
tomrichardson
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I have a 2000 2.5RS Impreza.
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Old 10-29-2000, 08:16 PM   #7
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ok...even if you were off by two seconds with the stopwatch, that would still give a 0-60 time of 10s. A stock RS should be able to do 0-60 in low 8's high 7's. Also, the stock mid pipe is 1.75" in diameter. Awhile ago, SOA confirmed this for on of the members here.

I don't want you to feel like I'm attacking you, I'm just kind of curious of the 3 seconds off the 0-60 that brought you down to the stock speed.

Jim
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Old 10-29-2000, 08:19 PM   #8
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I'd like to know to. I didn't know stock RS's were supposed to be that fast. I have about 6000 miles on it. You think it's not broken in yet? Maybe?

Thanks.
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Old 10-29-2000, 08:34 PM   #9
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Should be broken in just fine at that mileage. How has your gas mileage been?

Jim
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Old 10-29-2000, 08:39 PM   #10
tomrichardson
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Lately... it's been ok. Let's see, I went 160 miles and used a half tank... so around 20 to 25 mpg.

Now, after installing the new intake and exhaust, I did reset the ECU. However, afterwards... I remembered that I missed a step in that process.

That step is shutting the car off and back on after letting it idle for 20-30 min.

Don't know if that was a crucial step or not. But I thought I would mention it.

Thanks.
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Old 10-30-2000, 04:42 PM   #11
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Also, keep in mind that I am at 5000 feet here in Hailey, Idaho.

0-60 in 8 seconds is pretty good for that altitude I'd say.

Tom
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Old 10-30-2000, 09:49 PM   #12
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Question

Here's a question that requires clarifification -- Is your car standard or automatic? That'll make a huge difference in your 0-60 times.

LaterZ!
Darren!!
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Old 10-30-2000, 10:52 PM   #13
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My car is an auto tranny and it doesn't even take 12 seconds to get to 60mph.
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Old 10-30-2000, 10:57 PM   #14
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The altitude is what's killing his 0-60 times! There is a 3% power loss per 1,000 feet! Also, temp could make a difference, with a 3% power loss per 20 degrees warmer.

Larry
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Old 10-31-2000, 12:56 AM   #15
omahasubaru
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BTW the stock exhaust is 1.75" in diameter, not 2.25".

I'm running 2.25" mid and STi exhaust and it is much larger than the stock 1.75" exhaust. I can take the exhaust off real quick for pics if you don't believe me. You need to measure your midpipe and see that 2.5" is much, much larger than 1.75"
3/4 inches larger for the mathmatically challenged.

[This message has been edited by omahasubaru (edited October 31, 2000).]
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Old 10-31-2000, 09:15 AM   #16
BoomerRS
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a stock RS should run high 7 sec (close to 8 sec) for 0-60 (good weather, manual tranny). even with a 3% power loss for every 1,000 feet and assuming a 3% power loss results in a 3% increase in 0-60 time (im not sure about this one), 0-60 times should be under 10 sec. the numbers dont seem to make sense. does anyone have a g tech you could use?
thanks for posting the review!
is the jc sports exhaust the 2.5" mid with a N1 muffler?
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Old 10-31-2000, 10:27 AM   #17
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If the altitude is high enough I could believe the 12s time. I spent some time in the Smokey Mountains in the spring and I can assure you passing becomes quite a chore. However Tom, the intake and exhaust will be detrimental to your low end power, not enhance it. Any gains will be found from the mid to high end of the rev range.
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Old 10-31-2000, 10:29 AM   #18
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Personally, i still think those times are ridiculous.

I ran a stock RS, granted not up in the mountains, at 7.4 once and 7.5-7.6 consistently.

matt
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Old 10-31-2000, 11:07 AM   #19
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Well, here in CO, we're over 5000 ft., which is where he said he was... I've ridden in stock RS's many times, and it doesn't take 12 secs to reach 60mph...

-this has been Josh's 2 cents-
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Old 10-31-2000, 03:28 PM   #20
tomrichardson
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As I mentioned before... the 12 second times are extrememly rough. Also, I have been slowly learning how to drive these Imprezas, so before when I had the stock system, I couldn't drive it to its full capacity, probably still can't. I am only 18 years old. I have only been driving for just over 2 years!

If I think back, it wasn't really around 12 seconds.. it was more around 10 or 9. Make up for error (+-1) and newbie driving (+-1), that's around 8 and 7 seconds. So actually, it does make some sense. So my 8 second times, make up for error (+-1), that's around 7 seconds. Which is pretty good for 5000 feet.

I have a manual transmission. When I accelerate I never go beyond redline. I also go to around 5.8K and then shift. So 60mph is in 3rd gear for me. Is it really safe to go over redline? I'm not sure.

I have mobil 1 synthetic oil, so my engine oil doesn't break down as fast as normal oil. Not sure if it's really safe to go over 6K. If someone could clear that up for me that would be great.

So, with the correction of size of stock midpipe, a 2.5" cat-back is even larger difference than what I calculated in my original post!

Thanks for all of your comments!

Tom Richardson, Jr.
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Old 10-31-2000, 09:52 PM   #21
ImprezaL
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Hey, we're all here to help Tom... I was just hoping those times weren't real, cos something would be seriously wrong with your sube!!! But, luckily human error is more forgiving than mechanical
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Old 11-01-2000, 12:18 AM   #22
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I live at 6000ft and I'm pretty sure my car doesn't take 12s to do 0-60.
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Old 11-01-2000, 07:45 AM   #23
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tom you will have to come down to boise so we can compair the sound between your jcsports muff and my cheepo flowmaster setup...also remember after ~3000 miles the sound will change as it gets worked in

ack-altutide makes a huge differance with my svx it was boggie in boise but when i took it to vegas i could melt tires (FWD version)

-j
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Old 11-01-2000, 02:05 PM   #24
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Tom..now that you weathered the critiques on your times...you might want to consider Larry's intake system, which seems to preserve the low end torque and provide (butt tech here!)nice gains across the rev range...I believe Larry's early intentions were to restore performance at high altitude (5000 Ft.+). I installed a weapon r and then tried Larry's. Put the weapon r in storage in short order!

Bob B.
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