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Old 03-12-2015, 01:37 PM   #1
sbear
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Do you need an upgraded exhaust to maximize FI benefits?

Hi guys, pretty newbie here so please bear with me if I ask stupid questions...

From what I've been able to find, the narrowest point in the LFX exhaust system is 2.25". I know there's a couple of 2.5" cat-back exhausts available so would switching from 2.25" to 2.5" be beneficial when you go FI on the LFX? Or would it not make a difference at all.
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Old 03-12-2015, 03:29 PM   #2
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I still have 2.25" between my xpipe and muffler delete. I plan on replacing it with 2.5" just haven't yet. I've heard it makes a difference on a turbo car (don't know how much). Not sure about a supercharged v6, definitely couldn't hurt though.
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Old 03-12-2015, 05:52 PM   #3
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Depends on what kind of FI you use. If you go IPF supercharger, then yes, stick with 2.5". If you go turbo some way, then it depends on what your power goals are and where the compressor's efficiency is... If it fits the bill, you could use a 3" exhaust with a twin turbo set up.

Regardless, is it necessary, no, but more exhaust flow with FI is almost always better.
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Old 03-17-2015, 11:43 PM   #4
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Car pulled alot better when I switched from stock to solo (2.5) I also got my cats gutted at the same time
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Old 03-18-2015, 08:53 PM   #5
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Quote:
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Car pulled alot better when I switched from stock to solo (2.5) I also got my cats gutted at the same time
Big thing is having no cats with a supercharger. With the IPF super you probably gained little to nothing with the exhaust honestly, except perhaps at the top end.
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Old 03-19-2015, 08:22 AM   #6
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Wouldn't you run into emissions problems by doing that. I'm in Canada, we have quite strict emission standards. Granted, they don't test your car until it's at least 5 years old, maybe I can enjoy a supercharger & cat delete for 4 years
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Old 03-23-2015, 04:17 PM   #7
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Recently I added Stainless Works Headers to the exhaust and deleted cats, and I noticed a tiny bit more power with my IPF setup (could honestly have been placebo). Now I have cats back on to prepare for emissions, and I don't feel any loss of power. So in the end I feel like anything you do with the exhaust, in my case, is pretty negligible in terms of supercharger performance.
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Old 03-24-2015, 08:53 AM   #8
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Recently I added Stainless Works Headers to the exhaust and deleted cats, and I noticed a tiny bit more power with my IPF setup (could honestly have been placebo). Now I have cats back on to prepare for emissions, and I don't feel any loss of power. So in the end I feel like anything you do with the exhaust, in my case, is pretty negligible in terms of supercharger performance.
The cats don't sap power. It's when they melt that the issue arises. Though, if you get headers with the IPF super you should really get a retune, especially if you have no cats usually.
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Old 03-24-2015, 12:51 PM   #9
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The cats don't sap power. It's when they melt that the issue arises. Though, if you get headers with the IPF super you should really get a retune, especially if you have no cats usually.

I only didn't have cats for a couple months after I got the headers. But if I wanted a retune, do I contact IPF?
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Old 03-25-2015, 02:15 AM   #10
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Quote:
Originally Posted by sbear View Post
Wouldn't you run into emissions problems by doing that. I'm in Canada, we have quite strict emission standards. Granted, they don't test your car until it's at least 5 years old, maybe I can enjoy a supercharger & cat delete for 4 years
think I'm up for one of those this year
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Old 03-27-2015, 10:15 AM   #11
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I only didn't have cats for a couple months after I got the headers. But if I wanted a retune, do I contact IPF?
Yes, you should be able to tell them what you've done and they should just retune it, if I understand correctly.
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Old 03-27-2015, 10:27 AM   #12
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Yes, you should be able to tell them what you've done and they should just retune it, if I understand correctly.

Alright thanks. And guys I take back what I said about headers barely adding power. Since I got the headers at the beginning of winter it's been pretty snowy and after some hydrolock issues I got recently I haven't been really putting the pedal down much. But yesterday was nice and sunny and I got some good pulls on the highway, and there is definitely a noticeable inprovement on high end torque. I recommend anyone with an IPF setup to invest in long tube headers:
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Old 04-17-2015, 12:57 PM   #13
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So a follow-up question to this would be. Who makes 3" catbacks for the LFX? Biggest thing I can find is 2.5" like from Corsa.
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Old 04-17-2015, 05:24 PM   #14
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I think the cat-back systems for the ZL1 are 3"- like this quad tip example from Magnaflow http://www.hottexhaust.com/Magnaflow_15053

But it's gonna cost ya!
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