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Old 05-18-2003, 02:49 PM   #1
DDMan
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Default To those with borla headers (question)

I got my borla headers about 6-9 months ago, and they have been great, but one thing I noticed ever since I put them on is that there is a slight hissing sound whenever I'm on th gas. Im 99.9% sure it started right after I put the headers on. I highly doubt there is a leak..but I did use all the old gaskets (they only had about 10k miles on them). How can I tell if there is a leak, because the hissing is OK, but it just doesnt sound good when I'm only listening to the engine, and not the radio.

So here are my questions (incase u missed them)
If you have a borla header...do you get the same "hissing" noise?
How do I check to see if I have an exhaust leak?

Thanks!
Dan
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Old 05-18-2003, 04:56 PM   #2
Legacy777
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You shouldn't re-use gaskets.

99% chance you have an exhaust leak. Replace the gaskets.
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Old 05-18-2003, 05:36 PM   #3
dcoty
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Yeah, you should change gaskets, I will put my money you have a leak too. If you want to check, stop by any garage with a lift and ask if you can have them out it up for 2 minutes with the car on, then check by putting you hand near where the headers bolt up, as well as to the cat. If they are a nive garage, they probably wont charge you, you dont need anyone to help you.

Good luck,
Dan
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Old 05-18-2003, 09:55 PM   #4
JAnderson
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I had one of the first (seconed ?)gen headers and it failed. The weld cracked and I got it replaced for free. I heard the leak, but a mechanic found the leak on a lift one day and pointed it out to me.

The first time I put the header on I did use new gasketts. For the replacement header I did reuse them. I also used some steel wool and cleaned down the block. That will help as well.
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Old 05-19-2003, 03:17 AM   #5
Kostamojen
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I found an exhaust leak on my midpipe today (it was on top of the midpipe by the rear muffler connection, so it was hard to actually pinpoint)

I found it by going under the car actually feeling around for it. I had a general idea where it was though, but if you get someone to push the gas for you (I can do it if you need me) you can listen for it and find it fast.
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Old 05-19-2003, 04:11 AM   #6
JSiwek
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Yeah I'd say there's a leak also. I never got that sound from my Borla headers after I put them on. I also used new gaskets.

Another handy way to find a leak is to make up a solution of really soapy water and put it in a spray bottle and spray it on the areas where you think the leak would be coming from... if it's leaking, bubbles will appear right over the spot.

Jeremy
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Old 05-19-2003, 12:33 PM   #7
Puckaveli
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I would say replace the gaskets. Or you can take the header off and look at the gaskets for carbon trails. If they go all the way across the gasket; there's your leak. And of course while you have it off looking for leaks you can put new gaskets in.
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Old 05-19-2003, 02:01 PM   #8
freeriding420
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It could be a leak but I doubt it. They do have a tendency to sound kinda tiny. I mean you can go and look for a leak but there probable isn't. If you want to check it yourself, stuff a bunch of rags in your tail pipe, have someone stand on the gas while you feel around all of the joints and conections for a leak. I did that and couldn't find a leak, I replaced every gasket and it still sounds the same. It's just the way it is.
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Old 05-19-2003, 04:42 PM   #9
mysubaruimp
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i have the borlas. my intake is what makes the hissing noise. but it got louder after the header/cat back installs. just more air going through. the stock airbox and headers are made to be quiet, aftermarket headers and intake arent
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Old 05-19-2003, 08:27 PM   #10
DDMan
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Maybe I should put a stock intake back together and try it out...

Just seems odd, because I know it's been there since I got the headers on...

How much is a set of gaskets from Subaru? (all 3)
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Old 05-19-2003, 08:35 PM   #11
mysubaruimp
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i used old gaskets, shouldnt have, but the dealer wasnt open, and i am forgetful so i didnt think about gaskets until i was putting the header on, which was a saturday so all dealers were closed. no leaks though.
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Old 05-19-2003, 11:35 PM   #12
DDMan
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well...at least now I have the tools to take the headers on and off quickly....

Took me 4 hours starting at 8pm and ending at 11:45 in my garage alone when I put them on the first time...and I havnt checked the bolts since...for all I know I could have a huge leak

Ill probly check this weekend some time....
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Old 05-20-2003, 04:38 PM   #13
Dapper
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Default To those with borla headers

For one thing, you can reuse the gaskets if they are not torn.
The gaskets are metal for crying out loud. Don't waste $30 bucks on new gaskets when they are reuseable. Head gaskets are not reuseable!!!

Second, I have had the version 3 borla headers. They cracked in 4 areas. Got an bersion 4 as the replacement under the lifetime warranty borla has. Tested the dam things after I grinded out the welds for better flow with 2 of the three holes sealed the FAA rated duct tape & filled the third hole with an degrease/water mix to check for leaks. Yes, between the 2 into 1 on the driver side y fitting had a bad weld that you could not see or even fix with out cutting the bloody thing apart to just get to it.
So then Borla sent me a version 5. Didn't even care to grind the ports, did test it & it held water. The reason I used a degreaser/water mix is the wax that is used for the bending, I was going to remove 80% of it with a rinse. There would be less wax for the cat to burn off then. The gen 5 borla headers have not cracked, yet. The horizontal engines expand, borla does not have springs or any expansion joints in the headers, so they have had issues with cracks.

The point is, check the weld quality first.
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Old 05-20-2003, 07:29 PM   #14
DDMan
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they have a V5 out already? I have the V4's and they are great except for that funky noise...and its only worse when I have the A/C on too.

When I get the car to s-squared on fri. ill ask em to check for leaks too.
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