How will an exhaust make you lose POWER?

there are many exhaust companies out there and it is very hard to know which one are actually any good at increasing performance but are not excessive in noise.

The custom market is very big but are not usually the best for build quality thats not just a fancy tail pipe. just cause its made from Stainless steel does not mean the item will last a liftime, poor internal quality/design can rattle baffles loose or cracking of poorly welded seams can break external welds. The garage could go out of buisiness so no come back, they being a small garage could change owner and then no warranty with new owners.

Companies like UK based Miltec offer good overall quality (maybe not as tidy as Supersprint but still high) and have extensive research due to there ties with Uk tuning companies which mean the systems will give the best performance for your money, a lot better than a custom system in most cases. Miltec is at the moment what most tuners use as they're uk based and give better discounts to stockist than european brands (less shipping ect) but still giving high quality thru out.

Just phone a local tuner in your area and make a decision that suits your pocket but gives you what you would expect Quality