I wanted to clarify few things about exhaust system.


This is OEM G35 coupe exhaust system




1) Catalytic cnvrtr Right
2) Catalytic cnvrtr Left
3) Gasket Gasket Back
4) Front pipe
5) Front pipe Gasket
6) Center muffler
7) Center muffler Gasket
8) Rear muffler
9) Rear muffler Gasket
10) Front mount
11) Front bracket
12) Rear bracket Right
13) Rear bracket Left
14) Hanger Converter and pipe
15) Muffler Front
16) Muffler Rear
17) Front Front Right
18) Insulator Rear

I need a little help understanding couple of things.

Number 1 and 2 are Catalytic converters. They could be replaced by Test Pipe (which is a straight pipe without catalytic) and High Flow cats (which are high flow/performance catalytic)
As far as I know there are resonated and none resonated test pipes.

Could anyone advice on the performance between three of these products (resonated/none resonated test pipes and high flow cats)

Moving on to number 4. This could be replaced with Y pipe (correct me if I'm wrong)

What is the reason for replacing this part? And what are good combination for good performance gains (test pipe-Y pipe, high flow cats-Y pipe, Y pipe only, Test pipe only, High flow cats only)?


Could part number 6 be replaced separately (is it sold separately. I'm understanding that it's a Mid Pipe) Or it could be purchased with exhaust package only.


Basically just share you knowledge about exhaust system and its various parts and performance gains that could be achieved with them.

Thanks in advance.

 

All of this has been explained more than a few times already

 

Explain it again or GTFO!.

 

It's obvious why the test pipes and hfcs are beneficial but I'm curious too why people switch to just a different y-pipe.

My FI exhaust replaced the y-pipe with an x-pipe. Resonated, for sound only, I assume.

 

Yeah my main question is towards Y pipe as well.

I just posted about everything else in case someone else wants to know and afraid to ask cuz of all kinds of a$$holes


Another question.

If you have none resonated test pipes. Will X pipe fix the rasp issue?

 

I'm sure others will chime in. Not too familiar with single exhaust systems so was only giving my .02 cents on aftermarket duals. Are you considering a new exhaust?

 

I'm thinking about test pipes/high flow cats


So I'm trying to see the difference between replacing entire exhaust system or just that part.

How much of a diff you think it'll be between the two?


Also. Performance wise....TP and High flow cats are pretty much the same thing. The only diff is one cost more and other one is Illegal due to no cat?
Will both of them perform the same (loss on the low end and gain on the top end)?

 

i was always wondering the same thing but i never asked beacuse im to lasy to type a complete sentance and a$$holes here get very upset when you dont post in complete grammar

any ways from what i know

the Y pipe was swapped out on i believe a 350z from a DE to a HR y pipe and made a good diffrance so i belive aftermarkets ones should make a diffrance

 

I don't think you'll see much gain with TP's and the OEM exhaust. If you're going to do one, do the cat back exhaust and get HF cats later. I had resonated TP's with my FI exhaust and the drone was a bit much for me on the low end. I might try HF cats eventually.

 

TP and HFCs are pretty close, performance wise. From what I understand you see a bigger performance increase with TPs under forced induction applications.

With stock exhaust I don't think either would be that beneficial other than creating different sound.

 

What do you refer to when you say that?

Correct me if I'm wrong but is that the entire exhaust system without cats and headers?

 

My setup sounds perfect with the 300cell HFCs. I'll get TPs when I put the Vortech on.

 

^ A full aftermarket exhaust from the cats back. Some aftermarket exhausts only replace the muffler and utilize the Y and mid pipe.

 

Send your HFC's this way when you do.

 

Anyone got anymore input on the Y pipe and X pipe (or H pipe) performance please share.