4inch is all the bigger you actually need five is just deeper there is no egt reduction going from 4inch to 5inch no matter what power your making you wont see a increase in power goin from 4inch to 5inch
my 5" fit with the spare tire its kinda tight but it will fit and yea egts arent much different from 4" i like my 5" though if you get either a 4" or 5" dont make the mistake i did, dont get a muffler arty018:
4" will take you over 600hp if you want it too...only reason i bought a 5" is because of the sound...it is deeper...dont worry about your 4" being restrective though...egt difference will be very small, not enough to buy one over the other
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