I wondered if anyone has had any experience with Superchips. I am considering it for my '96 NA GM900 2.0 since I cannot find anything elsewhere. I've already got a JR filter which provides a useful improvement, and next Monday the car is booked in for a bespoke stainless steel exhaust at JP exhausts in Macclesfield. I just wanted to know if they were safe to fit with no adverse effect to the car, and accurate to their claimed improvement. They are claiming a 10bhp increase, for £295 fitted, which seems reasonable.