the 2.5 d22 is gutless / might be ok empty but who runs em empty / my d22 has a 3 inch which is great but in hindsight i would have had a 2 3/4 or a 2 3/4 past the firewall at least - there is just not enough clearance - i have had to panel beat the firewall to get more clearance - i cant remember the brand but the dump pipe cracked right through and had to be replaced and now there is a crack halfway round near the first cat flange - been a worthwhile episode but problematic - had no affect on the turbo-- i had worn out the turbo before putting in the exhaust at 250k // it now has 340k so all good