Originally Posted by zippyobrien

i always felt our one (was only a 300bhp evo 4)
felt good off bost, as in like a fast na car, then sort flat spotted about 3300, then came on boost but once on boost, (4000 ish) felt flat, the exhaust note doest change, just gets lil louder, then the turbo ran out of puff and that was it, fun over.

a good down pipe and 3" system made a huge difference,

will be interested to see what you can get out of it