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Old 15 July 2008, 11:12 PM
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Charlie_Boy
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Default H & S Backbox/Centre Pipe

How much difference does the H & S backbox/centre pipe do to the performance of a 04 STI in std form. I have a prodrive backbox but would like a bot more of the dugger dugger sound if you know what i mean. On their website it states 18bhp increase. Is this likely?
Old 16 July 2008, 01:41 PM
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BTTT.
Old 16 July 2008, 02:15 PM
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Originally Posted by Charlie_Boy
How much difference does the H & S backbox/centre pipe do to the performance of a 04 STI in std form. I have a prodrive backbox but would like a bot more of the dugger dugger sound if you know what i mean. On their website it states 18bhp increase. Is this likely?
Unlikely IMHO. The ECU will just adjust to maintain the status quo, biggest gains are to be had from de/sports catting the down pipe. You need a remap to really get the full benefit from exhaust mods.

H&S exhausts are excellent and the original scooby design backbox makes a lovely sound.

Ns04
Old 16 July 2008, 11:00 PM
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Well thanks for your comments, they are noted. I don't live to far from H & S.

HT04, thanks for the offer Watford is just a little to far for me but i trust you i have prob heard these and always wondered in envy why i hadn't got one.
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