-shane-

iTrader: (40)

Right i have a 2003 wrx ppp now yesterday i got my results of rolling road 247bhp to be honest expected a bit more, mods are aem cold air induction and ninja 2 backbox. Ive been told i shoud get myself either a decat down pipe or sports cat down pipe then decat and centre section and a remap and should see more like 280bhp? My car was running extremly rich he said 8 to 1,

With prodrive what parts of my exhaust system have been changed?

greatgonzo

iTrader: (1)

Hi mate I'm pretty sure that the 2nd cat gets removed only (the under body cat) with the PPP.
the cold air induction kit would not make a lot of difference if the car has not been mapped to it. As for the back box no performance advantage only a cool sound.


De cat up pipe and decat down pipe with a re mapp should give you what you are looking for.
Hayward and Scott are doing a group buy at the moment check that out.
Hope this helps.

Mark'sWRX

Yes, you will have a decat 2nd section as part of the PPP.

I'd get a sportscat downpipe (for MoTs and roadside checks) and decat uppipe and a remap. The remap should also help your rich running (which will be bad for the engine in the long term).

I'd also ditch the induction kit and get a Green or K&N panel filter. Induction kits can lower your bhp.

greatgonzo

iTrader: (1)

Do these road side checks actually happen
I know that van's and other heavy vechiles get stopped but Subaru's

-shane-

iTrader: (40)

am i right in thinking that this

Impreza Turbo 2001-2005 New Age : Subaru Impreza Afterburner Cat Pipe Cat-Pipe

I wouldnt be needing as i have a prodrive decat? I was looking at this downpipe

Impreza Turbo 2001-2005 New Age : Subaru Impreza Ninja Downpipe with Fast Flow 100 Cell Sports Cat

and centre section

Impreza Turbo 2001-2005 New Age : Subaru Impreza Afterburner Stainless Steel Centre Section

Mark'sWRX

Exactly right, although the centre pipe will not give you much more power, just a deeper burble and more cabin noise.

I would also get:

Impreza Turbo 2001-2005 New Age : Subaru Impreza Uppipe

Do it the same time as the downpipe to give more power and quicker turbo spool.

Mark'sWRX

True. I've never seen it happen, but it has been mentioned on here once or twice. I think you'd have to be acting like an ar$e or maybe on an illegal cruise to get stopped.

Aaron1978

iTrader: (12)

vans and trucks are getting stopped to check for red diesel, you don't often see cars being stopped for emmisions allthough they can. The biggest worry is if you get a keen copper stopping you for a random check and of course there is mot time.

Aaron

scoobian

not sure wot copper could stop you for re: emissions
MOT shows your emissions are/were legal

I guess they could ask you to get it fixed and prove at an MOT station ....but Ive never heard of it before

-shane-

iTrader: (40)

Ok thanks I wondered what up pipe was, always thought it was downpipe cat centre pipe back box

daz1968

iTrader: (13)

Would you notice much difference over the ppp with air filter, decat up pipe, sportscat down pipe and a remap. Also do you need ngk 7 plugs at this level. I presume a fuel pump would be required. (help me decide if to do this or wait and add pinks and a larger turbo, as un decided at the moment)
Thanks

Mark'sWRX

Probably not.

PPP gives you 260ish bhp. The extras above will give you 280ish.

I didn't change my plugs, but did change the fuel pump as a precaution, but wasn't strictly necessary.

Injectors and turbo could give you well over 300bhp, so personally,I'd wait and do that.

Steve_PPP

iTrader: (3)

i'd disagree and say if you're replacing the downpipe with a sports cat and decatting the rest (with a remap) then you will definately see a difference

WRX PPPs never make 260bhp anyway, its all prodrive hype

Trap2Terrorist

iTrader: (3)

My previous car was a MY01 WRX. It made 256bhp from a straight remap with a Magnex backbox and performance panel filter (I also fitted a Walbro fuel pump for safety), the rest of the exhaust was standard.

I then had it fully decatted and remapped again and it made 282/282, I ran it like this for over two years until I sold it last week and never had a problem.

daz1968

iTrader: (13)

thanks. I have ordered a walbro pump and a green panel filter. Just unsure if I need NGK6 or NGK7 plugs, Then will decide if to remap or wait and collect more parts. But am adjusting to the idea of remapping on the standard turbo and hoping I get an improvement, hopefully to performance and driveability.

s70rjw

iTrader: (2)

The remap will make a world of difference to the way the car drives. As has been quoted, Prodrive figures can be somewhat optimistic. A remap specific to your car will give greater benefits yhana generic one. I've had 2 PPP cars which varied massively in response and performance

Mark'sWRX

Fair enough. I could well be wrong about the improvements over PPP.

I went straight from standard to sportscat+2 decats+remap, so can't compare directly with PPP.

I'm not disputing that there wouldn't be an improvement, just that it may not be worth £1k+. That sort of cash would be better spent on ARBs, springs or brakes, maybe?