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I have the speed engineering ones and no issues. Headers, mid pipe, attached to the npp. I also put hi flo cats on.
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2018 2SS, A8, NAV, NPP, MRC, Sunroof, Hyperblue, LT4 S/C, LT4 Fuel System, RotoFab CAI, Headers, HiFlo Cats
2016 2SS, A8, NAV, NPP, MRC, Sunroof, Hyperblue (GM buyback)
1999 Trans Am Firehawk, M6, headers, no-cats, slp exhaust, hot cam, intake, 3:73 gears. Red/Blk
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