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i've got a MY97 with scoobysport backbox, k&n induction kit and a dawes devices boost controller, rolling roaded last week and came out at 260bhp
simon
My 97 had :
GGR ECU
Full GGR exaust
K&N induction kit
GGR quickshift
AP 4pot brakes
INTRAX supersport suspension
and many more.
278 bhp in dynometer with 39.1 kgr torque
1) Complete exhaust system inc down pipe. Should be open neck IMHO. Cost upwards of £500 fitted subject to type/supplier. 2)Induction.Either good pannel K+N or ITG or if you do not mind a bit of roar cone filter with cold air kit. you can make your own cold air system. After that it depends what you want to achieve & what cash you are prepared to spend. On a WRX I went for a chip next with great results & a side effect was improved economy in like for like conditions. Many will advise against a chip. In part I think it depends on who supplies & fits. Hope this helps.