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Message: <blockquote data-quote="Adam Vinnicombe" data-source="post: 1454536" data-attributes="member: 23446">Well I've done around a 100 miles today with two types of CAI systems. The first was the one I've borrowed that has a very small filter and goes in the wing. Well with that system I noticed no mpg increase or decrease, the acceleration felt the same as when the stock air intake was fitted BUT the mustang did fell more sluggish in the lower rpms with this type of system and there was a small increase in induction noise.Would i spend $200 plus on it NOT A CHANGE.The other thing I tried was to pop on down to Halfords (a car parts shop here in the UK )And brought a K&N air filter a big fat one and put that on the stock air intake hose just for shits and giggles and was surprised with the out come. Once again no increase or decrease in mpg, the induction roar was f@#king amazing it really was the engine sounded so much bigger than it actually is. Now because of the massive induction roar it did give the impression that there was more power, quicker acceleration and so on but in reality it didn't, it was just a tick. The extra noise just gives you the impression that there's more power, more acceleration and so on. The air filter only cost me £15 as wellSo long story short the £200 plus CAI made sod all difference, the £15 air filter on the stock air hose made the engine sound so much bigger but once again no improvement in power or mpg. May be a tune would of help out a little or like someone on here said earlier "once the cams and heads have been changed them an aftermarket CAI will make a difference)</blockquote>