Yeah LM1 gets very loud with longtubes and pretty much unbearable if you delete the CATS. all the GM LS6 intakes will be without EGR be aware that Corvette LS1 intakes had no EGR so make sure it is an LS6 (anything 01 and newer will be). And really for the mods you have now you should have a tune done. But def if you delete AIR or EGR you will need a tune and also if you do headers you also absolutely need to, so plan accordingly so you only have to do 1 tune
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-Nick
9/11/01 NEVER forget!
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