nik52wrx

Is there much power gain in removing the centre cat on an MY03 Sti UK.
Also, how much for a replacement pipe ?
One last thing, will the car still get through an mot without it ?
Cheers guys.
Nik

furrydice79

i reckon you will be fine with regards to the MOT as u still have the up/dwn pipe in place, and you should see some gain in power but nothin too substantial until u remap it,,,get a full decat and a remap and you will be laughing, when MOT time comes around just pop her on ramps and put a cat back on..

seanks

Very little to be honest with removing the centre cat, bit more noise and that's about it.
It's remvoing the cat in the downpipe were you would get the most benefit, oh along with the centre.
Not sure what year your car is but I think the new age models have a third cat in the up-pipe to the turbo also?

Best bet, remove the dp and centre cat, get a decent panle filter then EcuTek remap

Keep the centre section to put back on for MoTs, not that I know much about doing this mind you

bioforger

iTrader: (1)

Or get a highflow sportcatted downpipe, which has only got slightly less flow than a straight through dp, but you will still pass the MOT with the sports catted dp.

GaryCat

Removing the centre will give 3-4 bhp according to Power Engineering but the biggest gains are by decatting the down pipe or using a hi-flow sports cat.

nik52wrx

What sort of prices are we talking for a hi flow ?

GaryCat

About £550 ... not cheap.

http://www.haywardandscott.com/Detai...49&category=13

nik52wrx

StiX

iTrader: (4)

Bugger that - do what I have just done and buy a Scoobyworld Ninja Sports Cat for £299!

http://www.scoobyworld.co.uk/catalog...products_id=76

furrydice79

on tsl website, they mention that the sti requires 1 of the cat to remain for its much needed back pressure, there are lots of full decats sti on the road with no problems,?whats the deal?