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Old 02-19-2007, 11:50 PM   #1
djerickd
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Default GrimmSpeed HiFlow Exhaust Manifold Crossover review

I've recently installed my GrimmSpeed HiFlow Exhaust Manifold Crossover pipe and it's a definate improvement over the stock piece and compliments my ported OEM manifold setup very nicely. I didn't realize how the flex was constructed till I looked at it up close, well besides something in there rattleing you can see it necks down, ALOT. I was even able to put the heatshielding back on the Grimm pipe! So it's coated and shielded! I don't have any horsepower figures as my car is in serious need of a tune, but just driving around town feels much smoother on acceleration, just looking at the two pieces it's obvious it will flow more. The ceramic coating feels nice too I'm hoping to get the car tuned soon, I'm positive this piece will show improvements!

Thanks GrimmSpeed!!!



GrimmSpeed HiFlow Exhaust Manifold Crossover vs. OEM:






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http://www.grimmspeed.com/hiflow_crossover.php
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Last edited by djerickd; 02-19-2007 at 11:58 PM.
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Old 02-20-2007, 12:15 AM   #2
SubieRon
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great...thanks for showing off and making me want it more now

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Old 02-20-2007, 01:13 PM   #3
breathinez
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So your saying the cross over pipe helps in spool. If so how much sooner, 100rpm's? I have the Grimmspeed(before he was Grimmspeed) ported manifolds and was wondering if it will spool up my vf22 any faster. If I had the money available I think I would go ahead and get in on that group buy.
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Old 02-21-2007, 11:36 AM   #4
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thanks for the support guys!
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Old 02-21-2007, 03:51 PM   #5
breathinez
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Quote:
Originally Posted by breathinez View Post
So your saying the cross over pipe helps in spool. If so how much sooner, 100rpm's? I have the Grimmspeed(before he was Grimmspeed) ported manifolds and was wondering if it will spool up my vf22 any faster. If I had the money available I think I would go ahead and get in on that group buy.
Sooo, how much sooner will the turbo spool?
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Old 02-21-2007, 03:56 PM   #6
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Quote:
Originally Posted by breathinez View Post
Sooo, how much sooner will the turbo spool?
i cant really answer that because every car is so different. i'm hoping to get some flowbenching done in the next few weeks which will give us some exact numbers for everyone to go off of..unlike logging or dyno'ing a specific car. This way we wont be spouting out results that you may or may not get. make sense?

Justin Grimm
www.grimmspeed.com
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Old 02-23-2007, 03:39 PM   #7
breathinez
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Yeah it makes since. I was just wondering what peoplemay have been seeing on their specific cars. I mean I know its got to help some becuase of freeing up any restriction should yield better flow.
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Old 05-20-2007, 08:46 PM   #8
doylfish
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we'll need to update this soon for the V2 which is even bigger than V1
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Old 05-31-2007, 01:23 AM   #9
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I'll update with my (finally) installed v1 x-over. Great product, coating is outstanding [especially with the exhaust manifolds all from Grimmspeed]. Port and polish is always outstanding. Great place to get PnPnC service done.
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Old 06-28-2007, 05:44 PM   #10
03EJ20
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I just recieved my V2 xoverpipe and cant wait to get it on. Now i just need to PnPnC my stock exhaust manifolds b4 i can put it all back together. I hope its nice as its sounds
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Old 07-01-2007, 04:23 PM   #11
djerickd
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I want a v2! anyone interested in my v1?
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Old 07-01-2007, 04:25 PM   #12
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Have you guys noticed any slower spool with the Xover pipe?
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Old 07-01-2007, 06:20 PM   #13
djerickd
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I don't think so, I don't remember anymore it drives great!
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Old 07-01-2007, 07:09 PM   #14
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TIC stated in his post that up to 200rpm slower spool is expected.
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Old 07-05-2007, 09:32 AM   #15
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good deal !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 07-07-2007, 08:20 AM   #16
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your posting is good.
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Old 07-10-2007, 02:53 AM   #17
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Anyone with the new crossover notice a sound difference at RPM? These pieces are of excellent quality, but my car sounds like a sewing machine on steroids under a load. I don't have any exhaust leaks when revving the engine( I know what that sounds like sans a lawn mower or an old VW Beetle), but my tuner thought that I may have a leak, but I hear that the sound difference is typical with this piece. Just curious as to what everyone else was hearing. I am using Remflex gaskets on both the Exhaust Manifolds and the crossover pipe.
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Old 07-11-2007, 09:39 AM   #18
ray101381
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yup, that's what mine sounds like, i thought it was a leak too, but it's not
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Old 07-11-2007, 11:32 AM   #19
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Its kind of a really annoying sound too. Definately much quieter in the car than outside the car. Any reason's as to why this sound? Doesn't really make sense to me.
Anyone with the v1 crossover experience any funny noise?
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Old 07-11-2007, 11:42 AM   #20
ray101381
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it's supposedly the flex section that makes the noise, it wouldn't do it on the v1 since it doesn't have a flex section
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Old 07-11-2007, 12:57 PM   #21
trd6209
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Interesting about the flex section. At first it was making me crazy because a few people told me that my car sounded like a V-Dub Ya! Not what I wanted to hear. I was getting used to it until I went and dyno'd and my tuner told me that he's never heard that before and that he thought I had a leak. Made me start questioning myself on it.
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Old 07-11-2007, 12:59 PM   #22
trd6209
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By the way, anyone who goes with this setup needs to get the Remflex gaskets. They are awesome. By the way, the lower uppipe gasket is the same gasket as the the manifold to crossover gaskets right?? Can anyone confirm?
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Old 07-12-2007, 08:27 AM   #23
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no, it's a different gasket, the manifold to uppipe i believe is a wider diameter, you can order them through remflex.com run about 22 bucks shipped
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Old 07-24-2007, 05:44 AM   #24
breathinez
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Has anyone logged before and after or checked a/f ratios. I'm having timing pulled at around 3800 rpm's, when boost has come on strong. Not saying the pipe has anything to do with it because I may have borked my heads or something the other day. Overreved the engine terribly, but thats another story in another thread. I was just wondering what changes if any to the a/f ratios.
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Old 07-24-2007, 01:30 PM   #25
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Quote:
Originally Posted by breathinez View Post
Has anyone logged before and after or checked a/f ratios. I'm having timing pulled at around 3800 rpm's, when boost has come on strong. Not saying the pipe has anything to do with it because I may have borked my heads or something the other day. Overreved the engine terribly, but thats another story in another thread. I was just wondering what changes if any to the a/f ratios.
I have done quite a bit of logging since I installed my crossover and minifolds. I did street logging afterward, then did dyno tune, then more street logging and my AFRs are right where they should be. What are you seeing? If you want I can hook up, log exactly what you are logging (parameters, throttle position, eng load, etc) and see what I get so we can compare. Let me know.
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