Decat Up Pipe

[maxy]

just getting the parts together for an andy f remap level 2 for the 2005 wrx

but what is everyones thoughts on decatting the up pipe is it

is there a good power gain

is it worth keeping in to help with the mot as i am decatting from the turbo back

thanks maxy

[Richie Cross]

I believe you should decat because if it's got a cat in it, it's being more restrictive

than if there wasn't one.

Also, I think I've read something about the chance that the cat could break up and

you'll have bits going into your turbo....not good.

I think you can pick up cheapish STI ones that are decatted IIRC.

I got one from Meercat. £90 slip joint number. Basically a two piece, not connected (welded etc) but

once it warms up, a tight seal is formed.......or something a bit more technical than that!!!

[arch]

I removed all 3 cats and fitted a prodrive sports cat downpipe and passes mot no problem. The uppipe cat is restrictive and does affect spool. Fit a standard new age STI uppipe which has no cat or a classic standard uppipe without cat they are all the same. You will have to fit a 2.2K ohm resistor across the uppipe EGT sensor plug to remove the cel.

Edited February 16, 2010 by Arch

[C_WRX]

As others have said, would agree with comments, yes to getting it done for power and reassurance.

Think I have at moment what you're about to do, I've a 2004 WRX with decat everything with exception of sportscat downpipe (can't be bothered with hassle come MOT time). My uppipe came from Harvey & wrapped, but STi ones are also fine. I have about 280bhp.

[arch]

This may help