Short induction and decats....?

[Scrooloose]

My car is at Emerald at the moment for a bit of maintenance.

I'm thinking that I should get a short induction kit, linked decats and a new air filter fitted and get it set up on their RR whilst it's there.

The car is currently making 391bhp without these mods. Could I expect to see a reasonable increase with them?

[trackcar]

Emerald's rollers read about 3-4% less than mine here so if that's a 391 at emerald on long pipes you're doing VERY well, i would normally expect to see about 375 from your car as I think the 391 is from my rollers or nobles when it was last mapped? Short induction / linked pipes will gain 15-20hp for both of them but you will lose out under maybe 4000rpm compared to your long pipes (because your car is already mapped you don't get th opportunity to claw that hp back compared to a std car IYSWIM)but the engine will absolutely fly to the max power point compared to the long pipes and you will lose the clasic twin camel hump torque graph so the power delivery will be much more linear through the rev range.