club.liberty.asn.au

Good afternoon/evening all,

I was just wondering if someone can recommend a good exhaust shop that will not kill me all I want done is mufflers and hi-flow cats and both hitec mufflers and Liverpool exhaust quoted me $1500 which is a joke n almost the price of a full system so anyone that knows a good shop and happy to recommend please let me know

SIMO888 wrote:Good afternoon/evening all,

I was just wondering if someone can recommend a good exhaust shop that will not kill me all I want done is mufflers and hi-flow cats and both hitec mufflers and Liverpool exhaust quoted me $1500 which is a joke n almost the price of a full system so anyone that knows a good shop and happy to recommend please let me know

Quality hi-flow cats will cost $300 a piece, so what you're asking for is - $1200-1300 in parts alone (Muffs + 2 100cel cats). If you want to get some cheap crappy cats off eBay for $100 - source them yourself and bring them to the exhaust shop.

Since your car is 4cyl N/a, I'd skip changing the cats altogether. WOFTAM.

actually alex after speaking with KiDo there is some power to be made from changing cats and mufflers once they have been tuned n fact of the matter is so many people don't know or realise the true potential of N/A

SIMO888 wrote:actually alex after speaking with KiDo there is some power to be made from changing cats and mufflers once they have been tuned n fact of the matter is so many people don't know or realise the true potential of N/A

No there isn't.

Even if remotely true, the minuscule gain in top end power will not make up for the significant loss of down low torque

The stock cars will not be choking the engine flow in and out

But its your money. If you see value in dropping $1000-1500 on an na car to make an extra 5kw and lose low end torque, then that's your call

Mick

boom

di20t actually just from doing at tune and E85 tune its gone from a stock 127kw to 168kw so enlighten me how a 2.5i N/A will gain no power, you sound like the guys from MRT lol

SIMO888 wrote:di20t actually just from doing at tune and E85 tune its gone from a stock 127kw to 168kw so enlighten me how a 2.5i N/A will gain no power, you sound like the guys from MRT lol

Mate you're confusing what Im saying

No where did I say there's no power to be had from a 2.5 n/a (albeit 168kw sounds a little exaggerated for my liking).

In fact, assuming 100% volumetric efficiency (which is near impossible with stock cams), then your head would need to flow 225hp to make 168kw, or around 350cfm.

It would also need to be making this power at about 7800rpm, so I'm assuming your engine revs to 8000rpm here

To put it in context, a fuly ported and race prepped head i know of that was very recently assembled, flows 236hp n/a or 221cfm @ 28" and 0.050" lift (over 370cfm peak lift).

Back to the topic - my point is that the high flow cats are not restricting your engine flow at the moment and thus not worth upgrading in my opinion.

Was not hating. Good luck

Mick

SIMO888 wrote:di20t actually just from doing at tune and E85 tune its gone from a stock 127kw to 168kw so enlighten me how a 2.5i N/A will gain no power, you sound like the guys from MRT lol

I'm interested in the power gains, dyno runs before and after exhaust?

that's something I'm looking at doing fedaykin and the only one id trust to dyno is KiDo very smart man

It would be interesting to see the curves.