I have done the exhaust also and want to do the cold air. One thing at a time. Wife's car is ten years old and she is on my ass about getting a new one. (Can't blame her)
Please post the pics:
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Serious - if you guys want to know anything about the 4.6, 5.0 or LS1 and what "wakes" them up at what RPM's, let me know. I've had each of these and can give you the DO/DO NOT's of each, what is waste/what isn't, and what I got the most out of on the dyno at the rear wheels.
On the 4.6's I can tell you a few basic things:
* Don't waste money on the cold air KIT or any kind of RAM Air intake. The K&N or Wix by itself will actually net you about the same RWHP gain which is honestly about 3-4. Yeah - its a sad reality but thats all ya get from this mod.
* Exhaust is ALWAYS the best bang for the buck with WHP. Flows sound better, but Dynomax is better on gains. Cut the cats off as well. Just be prepared for your check engine light to come on. MIL's can rid of that. Long tube headers are good too. Shortys are just a tad above the stock manifold to be honest. Plus, the long tubes sound badass.
* Power adders are your 2nd best bang for your buck. I had a 2 stage (50-75) wet Nitr Exp system on the SS and a 1 stage (75hp) on the GT. When you kick it, you wouldn't believe the difference. Just be careful. If you get the compression ratio too high or its too cold out, you will blow your manifold. I almost did this once in Reynolds, GA at test n tune.