Apologies if this has been asked before but I couldn't find it.

I've got a 2005 sti non pro drive which has currently just got an aftermarket back box on. I'm looking to get an unresonated centre section and also remove the second cat.

My question is will I be ok to run the car without the second cat without a remap? I am intending a remap at some point but is it advisable to leave the cat on until this point?

Thanks in advance.

 

fit the exhaust then go for the map asap and dont kick its face in until mapped

 

Thanking you!

 

That's true? I thought you could change the centre section and backbox without a remap..

I'm probably wrong though! Would be nice to know now rather than before I fit it. I know changing the downpipe for a decat one would need a remap.

 

I have prodrive second decat for sale mate. Pm me if interested.
Cheers Ryan

 

Yeah you can change it, just don't go mad until mapped mate.
Also have you checked what spark plugs you've got in? Although I'm 99.9% sure what you've got are up to the job, still worth a check tho mate.

Joe

 

If you leave the downpipe cat on it'll be fine.
Removing the 2nd cat and centre won't require a remap, this was my first mods, this didn't put the cel light on either.

Remap only needed if you fit a sports cat or decat downpipe.

 

Mixed opinions then. I must admit I thought the decat in the down pipe was the one that made all the difference.

 

I have a complete decat system for sale if you need one, believe to be an afterburner system ;-)

 

Over a standard downpipe cat it does...sports cat only a couple of bhp's down plus full decat won't pass an mot.

Decatting the 2nd backwards will just add noise, that's all I found, only when I replaced the downpipe with prodrive cat and remap did I notice the difference.

Full decat even more noise, prob pops & bangs maybe flames too lol so they have that going for it.

 

I'd love to do the full decat but can't be bothered with the hassle at mot time.

 

Exactly the same reason I didn't do it. Like I said you are only down a few bhp at the top end, and I'm never going to feel that
Stick to what you have planned 2nd cat, centre, bb and you'll be fine no remap needed.....or try and source a sports downpipe cat i.e. prodrive they are often about for sale, then remap it.