If the DSE subframe will accomodate headers for a stock subframe, go with the ATS Tri-Y's if the budget allows. They are the best you are going to do short of a full custom set of Tri-Y's for your specific application designed/built by the "good guys" (i.e. Burns, FWRC, yadda yadda) and won't fall short of full customs by much in the performance department.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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