I am looking to replace my factory air box in my 4cyl Jetta with either a K&N or something from eurosport or neuspeed. I was wondering if anyone has actually seen significant power increases with heat shields etc., and if it is worth the investment. I know that along with the filter I should also upgrade some other parts, but I'm not too sure what I should get.
Any advice would be greatly appreciated.
thanks
Any advice would be greatly appreciated.
thanks
