Your opinions please, both good and bad.

Steve

Steve do you mean cutting it out or replacing it with a new downpipe.If its the latter it makes it run great all the way to the red line, i dont know if it possible to just remove the existing cat in the OEM downpipe, Probably not and the dust created by removing the cat is toxic.

Zippy

No I meant by installing a de-catted downpipe.

Steve

Steve do it you will love the increase in performance.

Zippy

Yes, i found it to make a big difference.

on the rollers i was at 230bhp and that was only with a Prodrive WR B/Box & Scooby Sport down pipe.

Rice Rocket

Just go for it,

I changed the exhaust a while ago with a decatted SS d/p and u/p matched to an HKS Hiper mid and back box.

The difference in performance, and noise, was really noticeable.
The flat spot previously existed at 4k simply dissapeared and the car was measured at 249Bhp on the rollers.
I think the d/p and b/b makes the big difference.

Kostas

Any bad tales. I've seen some bad experiences on here and another tuner has advised against removing the downpipe cat.

Steve

One downside is you will need to buy a little black box to trick the ECU. If you dont your CEL will always be lit !

Go on steve you know you want to...;)
Had mine on for 6 months now (de-cat turbo back)and no problems at all,
up pipe next on list:D

Steve

Up-Pipe, down-pipe and fully system on my MY01- no problems other than an uncontrollable grin. The idle can be a bit lumpy but it was never a V12 to start with:D

simon:D

Some people have found that a decat creates a great flat spot before the turbo spins up - the powers higher up but much better.

One well known motorsport dealer doesnt like the de-cat because of this flat spot.. but the people he sells them to love it!!

Horses for courses..

Jza

http://dyno.scoobynet.co.uk/uk/01_ba...ullexhaust.htm

Not what I would call a flat spot before its on boost ;)

[Edited by Pete Croney - 10/19/2002 11:40:55 AM]

Running a Prodrive backbox and centre decat, scoobysport de-silencer pipe and Magnex downpipe and turbo downpipe.
Car now runs as good as it sounds (roars and pops), and decatting the two downpipes shaved almost a second off my 1/4mile times :D

Just need to get the OBDII now to put out the CEL.

Paul

I had one of Mr Croney's finest exhaust systems (DP, centres and back box) on my MY01 for nearly a year now - no problems what so ever. Pulls throughout the rev range and makes a lovely noise. No dodgy tickover / idle - do it you know you want to :)

Chris

Hi,
how often do you hear your pops and crackles guys?? what do u do to hear them, only have Up pipe cat left gonna get it done as soon as Pete up dates his site!! Is there anything i need to know??

ScoobyDoo69

Mine pops in the midsection declutching on a gear downchange. Bangs in the backbox are more random on a spirited drive (never when you want them e.g. passing old ladies at the busstop) :D

Paul