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go 2" headers. some will say you don't need them until like 700+but there is no negative side to running 2" over the 1-7/8 plus if you do more mods you already got the bigger headers. I know of someone who actually customized bigger then 2" headers and seen 22 rwhp difference on a 416 NA motor. TSP is best bang for your buck. i got my headers non-catted new for 650 and had them locally ceramic coated for like 150 bucks. fitment was good and no issues in 2 years use.
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2018 1SS M6 - OTR intake, HI Ram intake, Ceramic Coated TSP Headers Catless, AWE Touring Axle-Back, Flex Fuel, Pray Performace stage 3 cam, TSP ported heads, Pray Ported 95MM TB and Ported HI-RAM. SJM Line-Lock. F14 Drag Pack 17's with front skinnies. Tuned by Pray Performance.
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