Exhaust Question?!?!

Hi! I currently have a bone stock 2002 GT 5 Spd (except for a MAC catback and FRPP "C" Springs) and I started to look for a better exhaust system there are my choice for now:

MAC all the ways:
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Long tube: 349.95 (uncoated) 469.95 (ceramic coated)
H-pipes with cats for longtube: 389.95

Total (I'll keep my catback with this setup): 739.90 (uncoated lt)
859.90 (ceramic lt)
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BBK all the ways (except for catback):
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Long tube: 399.95 (chrome) 499.95 (ceramic coated)
H-pipes with cats for longtube: 339.95

Total (I'll keep my catback with this setup): 739.90 (uncoated lt)
839.90 (ceramic lt)
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SLP all the ways:
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Long tube: 823.95 (ceramic coated)
X-pipes with cats for longtube: 329.95 (SLP doesn't make H-pipes)
Pro-Flow Catback: 514.95

Total : 1668.85 (with catback) 1153.90 (without catback)
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Now here is my problem, I know SLP offer a better quality then the other but If i go MAC or BBK I can almost buy myself a good set of cam for the same price as the SLP setup....So I need your help...I want a deep exhaust tone and some good performance gain?!? How much do you think a full exhaust like those should give on a stock 2002 GT and what about the sound?!? I want it as deep as possible!


Thank for reading!


P.S.: I know I should do 4.10 and Short Throw before...but this I already know! I'm just trying to decide on wich exhaust setup!

I'm already getting a MGW short throw and FRPP 4.10 before I do the exhaust...I was just asking if the greater performance gain of the SLP setup over my others choices was worth the extra money (~800$) and what kind of gain I should see from a complete exhaust system LT + catted H-pipes on a bone stock 5Spd 4.6L.... With the fact that my best 1/4 (100% stock with air silencer, paper filter, spare tire and a full tank of gas) was 14.321@100.575 MPH with tons of wheels spin off the line and a crapy 2.227 60 ft.