Had a local tuner put my agency pulley on for me the other day.

Seems a little more "urgent" than before and a tiny bit more responsive to throttle touch. Oddly enough it sounds a bit more growley than before although i cant see why it should. (sounds good though)

Its had absolutely no impact on a/c or anything and its starting to approach 35C here.

Am i happy? Yes.

Was it worth the Cy£77 + £15 install? Dont know as its my first mod.

The tuner said that short of going FI my money would have been better spent on an intake as the 8 breathes badly, or if i were to spend a bit more a midpipe+catback

 

actually the intake is pretty well designed from factory. Not much gains could really be had from there nor any bolton mods.

Midpipe+catback+fuel mgmt, would probably give you the best gains na.

 

RX Tuner got almost 10 whp from the intake & lightened flywheel (releasing a few hp from lighter equipment) & Inport Tuner gt 3-4 whp from the REVi without the Ram Air Duct, so hp gains are not bad from an air intake. If you are expecting 15-20 hp, then that is not realistic.