In all honesty you would see a slight difference in egts but with you only sticking to the lower hp settings and not pushing for high hp you can save your money and get a 4 inch system. It is all preference though and most people do prefer the look and sound of a 5 inch. I prefer the look and the sound of the 5 inch but if you need to save some coin the 4 inch will do you just fine. Lots of race trucks still run the 4 inch as well.
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