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well.... It has occurred to me now that we are 3/3 on exhausts that don't x-pipe or use a "plenum chamber" to x the gases. Causing back pressure on decel

1) the op exhaust

2) taitec center exit

3) HKS (the hks muffler looks like the oem style but it actually 180's the gases and they never touch

The oem muffler is the example of the plenum chamber style... notice the exhaust pipes that end with tips exit the same location of each side of the muffler

Without combining the 2 banks of the motor... back pressure is causing your problem

Regards