There's a good chance that your current test pipe wont have the donut crush gasket. Few aftermarket test pipes have revisions for it.
I've used 3 different test pipes with various 3 bolt gaskets and the best sealing ones were the ConceptZ thick gaskets.
you have a picture of what test pipes are on the car now?
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RHM 75mm TB & ported up/low mani., 3" intakes/velocity stack, Z1 Headers, Motordyne ART pipes, HBP 3.5" exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, Bell Raceworks diff brace
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