Well considering my 1/4mile time, I think it's safe to say that the 57i works quite well on my car. And yes I have a very effective cold air supply.Rosh said:as mentioned by jhonno; u may feel that the 57i is working well with ur 20XE engine, but you're bound to be loosing a couple of bhp due to the heat it draws in from the exhaust manifold. Unless you've segregated the cone filter in such a way that only cold air is sucked in (building a surround chamber), i should think that the modified airbox and panel filter will be better in terms of peformance.
Every XE is different as we all know but I guess (i've fallen for it) the raw induction noise is somewhat of a novelty to us non-tb'd peeps!
I'm not quite sure on the Astra GTE 16V but is there a resonator box in the front bumper?