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sports cat #1630168
27/02/2019 23:11
27/02/2019 23:11
Joined: Sep 2015
Posts: 151
Birmingham
SimonN Offline OP
On a journey
SimonN  Offline OP
On a journey

Joined: Sep 2015
Posts: 151
Birmingham
Hi, I've been investigating exhausts. I'm after a full exhaust from turbo back. I spoke to a bespoke exhaust place today, and they basically told me that there's no point having a sports cat on an "old-skool" car like the coop as it's not going to pass emissions (but it would be ok on a "modern-technology" car - he didn't seem very sympathetic towards the coop, tbh).
Has anyone any thoughts on this?
I have a sports cat on current setup which is great, but I have a bunch of mods queued up so need to upgrade the exhaust.

Re: sports cat [Re: SimonN] #1630170
28/02/2019 06:58
28/02/2019 06:58
Joined: Feb 2006
Posts: 138
Czech republic
Honza Offline
On a journey
Honza  Offline
On a journey

Joined: Feb 2006
Posts: 138
Czech republic
unless you have camshafts with soooo much overlap, you are able to pass emmision even with sport cat.

However - I recommed to fit 100CPSI only with biggest body possible (I have 100CPSI -127mm body diameter in my 2l 16v NA beast) to reduce backpressure

Not many manufacturers give info regarding to max bhp its suits for, but 100mm diameter core with 200CPSI is good up to 150, mabe 180bhp, then it creates lot-of backpressure (in my case causing misfires under high load/rpm above 3500).

beware of cheap cats - they don´t do their job, or only for short time (the reason is amount of precise metals in them..).. only choice is HJS...

Last edited by Honza; 28/02/2019 06:58.

05 15.84s
06 14,79s
07 14,9s
09 14.4s
11 lot of things to do
.
.
17 back on the road smile and much stronger
Re: sports cat [Re: SimonN] #1630222
01/03/2019 01:02
01/03/2019 01:02
Joined: Feb 2008
Posts: 1,709
London
kj16v Offline
My life on the forum
kj16v  Offline
My life on the forum

Joined: Feb 2008
Posts: 1,709
London
The best cat for a turbocharged engine is no cat. Anything else will lose a lot of horsepower and murder performance. But if you don't like the idea of having to refit the cat for the MOT every year, or don't have a - ahem - "friendly" MOT tester, then, as above: widest sports cat you can fit.

Re: sports cat [Re: SimonN] #1630306
03/03/2019 00:50
03/03/2019 00:50
Joined: Sep 2015
Posts: 151
Birmingham
SimonN Offline OP
On a journey
SimonN  Offline OP
On a journey

Joined: Sep 2015
Posts: 151
Birmingham
Ok, thanks for the info.


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