Tazz Kill Er

Would a de-cat downpipe or a de-cat centre section give the best performance gain, and would it still pass the mot test. Also would it be better to fit a sports cat as the only one?

funkyspider

My 01 passed MOT well within limits with centre cat removed and just downpipe and up-pipe left on.

Now have a sport cat downpipe to put on and will be decatting the up-pipe at same time, if this fails I dont think its too hard to get hold of a cat centre to stick on at MOT time.

ian10

if you have a newage wrx remove cat in upipe and 3rd cat after down pipe

if sti newage remove 3rd cat

sports cat downpipe makes abig difference but it would be best ro get car mapped to suit

Tazz Kill Er

Forgot to mention it is for a MY98 Classic, Thank's for the quick replies though guys.

ian10

classics most people remove all cats and put a one box only system on,and have a friendly mot station!
if not get a sports cat down pipe (pricey) and as above

MaDaSS

funkyspider I have the TSLThundercat downpipe on mine, and had it on for a good 18 months before my first MOT this year in May. It passed no problems, and that was the new type MOT as well.
I never saw any figures for the emissions, but i got my MOT so i aint fussed TBH. lol.

martin800

i have a fully decatted my99 which needed mot'ing last week. refitted the standard center section (took ten minutes) and it passed the emmissions test easily!