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Easy answer! Intake & Exhaust, K&N makes and aftermarket air intake for the 98' Firebird so do several other companies but from personal experience nothing beats or surpasses K&N when it comes to adding a few more horses under the hood. Exhaust wise I would recommend a flow master or dynamax muffler or go wild and go loud with a glass pack like cherry bomb or thrush and if you really have balls either go no muffler straight cat or cut the cat and go manifold to muffler, now obviously due to pollution laws most likely in your state this is illegal but i've seen it done, do at your own risk. NOS is another option but expensive and can be dangerous if you don't know what your doing. Anyways there are several more options but just as well several limitations due to the engine being a 3.8l so when all else fails buy a V8! Good luck and happy speeding!
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98 + 38 = 136
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