Hi, i have a 2003 bugeye wrx and i have got a stainless scorpion backbox and a k&n filter to put on.
What kind of horsepower gains can be expected, if any, and do i need to re-map???

Cheers

 

if you are going to fit an induction kit you will need a remap and without one the two mods wont make much noticable difference, after a remap your looking at 270 ish bhp.

 

not a chance 240 would be pushin it, u shud be atleast putin on a turbo back, they only cost £200 of ebay and are actully really good and sound awsome, will get u 250 ish

 

Not really, the td04 is good for 270 bhp, with a panel filter and an exhaust.

 

didnt say it isint but ur nt gona get that with just a filter and back box, to get 270 u will need a full system from turbo and also a walbro 255l fuel pump

 

i have a K&N filter, turbo back catless exhaust, walbro fuel pump on a 202 bug wrx and a remap for 279bhp/280lbs, best thing ive done, would advise u to do it u wont regret it, oh thats a td04 aswell

 

exactly what i sed just the bigger turbo will take u to 300 ish and would recomend cause spendin extra 300 quid for extra 30 ish bhp is worth it, im running a vf35 at the moment at 347 bhp so atleast u have room for improvment with it too

 

you will not get any bhp gain on a wrx by just doing these two mods, you wont get any benefit from just a back box.
To see any really benefit what i would do. first get your self a 3" Stainless Full Exhaust System, K+N Typhoon Induction Kit and a remap. approx 270-275 bhp.
add a vf35 turbo +remapp and you will be looking a approx 300bhp. then by adding Uprated Injectors,Uprated Fuel Pump and a Fuel Reg you should be able to get it up to around 330 ish
Any more then that you will be talking big money. after all BHP+reliability cost money. what i would say is dont be tempted to do cheap mods it will cost you bigger money in the long run.

 

I am sorry but I disagree.

Just a remap with those current mods will see around 260-270bhp

As far as taking it further ...

Replace the centre cat with a straight through pipe and add another 5bhp
Replace the downpipe cat with a bell mouth downpipe and add another 15bhp

Then if you want over 300bhp then VF35 or similar turbo, fuel pump, injectors and sti tmic should see you around 320-330bhp

Dont bother with the induction kit - you will not gain anything
No need for a fuel pressure reg either.

 

Cheers for all the advice, ive got to stick with a k&n panel filter and the pipe for now its a 4" scorpion stainless. Anyone know where the nearest place i can get a re-map done?? I'm near Gillingham Kent??

 

dynamix is the man you want to speak to about remapping.done a great job on my bugeye she is running 295bhp with an full exhaust system and a panel filter