I will have to disagree with the statement above. I run a GP I/C and the only reason I do is that it looks stock under the bonnet, the GRS performs better. I have dynoed both I/Cs back to back and the GRS one came out on top for bhp. Gained 6bhp from memory (got a graph somewhere). I would switch to the A2A GRS but I am looking for one 2nd hand as rather than pay another £400 out for an A2A I would buy the W2A GRS (sell the GP I/C and add £400)Having tested GRS & GP Intercoolers back to back on the dyno I would stay with the GP as there was no difference found.
Where those Dyno runs done back to back or did you go for a drive with the GRS one first? Reason I ask is that it is odd that Jaw's car found the opposite.Having tested GRS & GP Intercoolers back to back on the dyno I would stay with the GP as there was no difference found.