Another factor to think about
: You can get away with running the stock ECU tune with most simple bolt-ons (e.g. HFCs, etc), but a full set of intake/exhaust boltons including LTH pretty much requires a dyno tune. I know because I'm running LTH on my stock tune right now (temporarily), and the bottom end of the rev range is horrid once the engine is heat-soaked, it's worse than stock
