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it depends on what ur doing. on a DD with say 350hp, 4 inch is plenty good enough. from what ive read, a 5 inch will cost u a lil more hp on a dyno if ur less than 500. good luck
5 inch really dosent make any diffrence over 4" , I know tons of guys have posted that heat loss and so on and so on...It's bull. Maybe .5 RWHP . If your worried about power loss with 5" wrap the charger and part of the down pipe!