Hello everyone i was searching the forum and couldnt really find a straightforward answer to my question,so i was wondering if anyone could help.I've had a 1997 147 bravo hgt since about jan last year and was wondering how to get some extra bhp out of it.Usually the best option is an air filter then a chip,but i cant seem to work out which hgt can be chipped the 155 or the 147 and next(if its the 147)is has anyone had it done on a 147 and are the results noticable?A friend had his vauxhall chipped a while back and it ran like a dog afterwards in lower revs,it was cool when you hammered the nuts off it but kept stalling.In the end he took it back and had original settings replaced.I wanted to get a chip rather than cams exhaust etc as they usually cost hundreds=thousands for a small increse,usually unnoticable.Any help or advice greatly appreciated,cheers.al