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If you want power, get a downpipe first. The cat-back is not nearly as restrictive as the stock downpipe.
You do not NEED a tune for an exhaust. The MAF will adjust very well to a turboback and advance timing based on the increased scavaging effect. But of course if you want the full benifits of all your parts, then tuning is the best bang-for-buck option.
Every HKS exhaust I've seen is not a true 3". They have neck downs at the flanges which will disrupt airflow. And don't waste your money on titanium. As stated above it's a waste of money for the slight weight savings that won't do you a bit of good on a full weight street car. Only thing it's good for is emptying your wallet and having the very short lived moment of "cool" when you tell someone it's Titanium.
Buschur, AMS, RMR, etc....stick to a full 3" exhaust made from stainless steel. It will last longer than your car, will sound great and will cost less in the long run.
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Lot's of AMS Goodies
Best 1/4 11.75@121
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