Pontiac Problems? Ask a Mechanic for Answers ASAP
exhaust systems are one of the best and most cost effective ways of increasing performance as a good quality catback can often yield 4-5% improvement over the stock system
and as for improved suspension then you need to spend about $1000 a corner to get an aftermarket coilover thats possible to tune to a higher standard than the stock item as you need seperate bump and rebound adjustment and a progressive rate spring to achieve a good quality ride with better body control than standard
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