[QUOTE=Unlimited04;10903512]throttle body spacer is a complete waste of money and does nothing for the type of fuel injection system thats on a TJ. it makes a good paperweight, thats about it.
a cold air intake does absolutely nothing for a TJ either. in fact, they're often worse than stock and give poor filtration and let junk into your engine.
So if I do notice any gains at all, it will most likely be the Banks exhaust and nothing in relation to anything done on the intake side? What about skipping the intake mod and going to a high flow air filter in the OEM box? Any benefit? I've read lots on JeepForum and other sources about these upgrades and there is quite a mixed bag of reviews and opinions on both. I am uncertain as to what gains any catbak exhaust can do without a high flow cat. I guess my thinking is that any restriction on either end will cancel out any benefit possible from only modding the exhaust or intake alone. It does make sense that the biggest culprit of restriction would be the exhaust due to emissions regulations. I'm in the same situation with my sportbike. I've added performance pipes and K&N air filters and now I'm looking at fuel management upgrades, the opinions are the same mixed bag, some say ECU upgrades are a waste and just as many say it's worth every cent.