I've got a scoobysport BB, everthing else standard. If I replaced the down pipe only leaving the standard middle section would i

1. gain useful power
2. still pass omisions
3. keep about the same noise level as present (not too loud)
4. be spotted at service time (warranty)
5. really need remap as well?

what dya reckon?

 

IIRC from previous threads:

1) Yes (also brings turbo in 500rpm lower)
2) If the car is tested when hot
3) No, it would be louder.
4) Most probably
5) Not necessary, but useful to really exploit the better breathing.

Would need to know more about the car to advise further.

 

thanks for the reply its a o4 wrx standard apart from the bb

 

hi cat 7, does the b/box make the car much louder round town/motorway driving have wrx 03 considering making the change, does it produce any more power?

 

Slight differnt angle to this,
How much extra noise / power would expect to gain from fitting a cat free up pipe - like in the STI's to a standard WRX apart from back box ?

 

its quite a bit louder outside (not max power load) and you can hear the burble on accelerating and tick over. When crusing on the motorway its no real louder than standard (bonus). Not sure about any power claims as I can't really remember with the standard can on.

I drove around for the 1st week with the back windows down because

a I'm sad

b it really makes a good burble noise

I'm looking at ppp or the full ss system (can't really decide)

 

According to a lot of people on here the car will not pass emmissions with centre cat only. Its 2 years away anyway, you never keep a car that long, so don't worry

It will sound like my last bugeye, and you know how good that sounded, as did the neihbours after you ragged it up the street!

Forget PPP, Full decat and Tek3, you know it makes sense