Janspeed have now released a new cat back exhaust specially made for the astra Mk 4 (G). It has been designed so that you can get a better sound than standard and without failing the emissions laws involved with your MOT.
They have called it the S1 and comes in a twin round design, its hand made from stainless steal and has a lifetime guarantee. Janspeed are claiming higher torque figures and 3 BHP gains from this new exhaust.

Was reading the above on the news part of the AS page, just wondering if any1 has got the S1 system or just the back box version and what you thoughts about it are. The Jetex system seems to be popular what are your views on these. Also any other recomendations?