Stock Nismo exhaust with forced induction - power loss expected?

braydo25

Hey guys,

I have a TT Nismo 370z making around 500whp on 7psi right now with a full 2.5" true dual straight pipe exhaust (No crossover). The only things in the exhaust are a resonator for each side of the exhaust.

The car is so loud lately that I can't drive it without getting a headache or wearing earplugs.

I'm planning on throwing just the stock '13 Nismo muffler back on the rear of the car so the system goes from each turbo -> 2.5" true dual straight pipe -> each pipe into it's own resonator -> a little more 2.5" piping towards the rear muffler -> each pipe into 1 of the inlets of the Nismo exhaust.

I've noticed the Nismo inlet piping diameter is 2.25", so I'll be using a concentric reducer from the 2.5" to 2.25".

My main concern is will adding the rear muffler inhibit spool / power delivery a noticeable amount? I'd assume no given the nature of the true dual system - each sides' 3 cylinders having at worst 2.25" diameter piping to flow through independently.

Also, would perhaps adding an H pipe into the exhaust configuration prior to the resonators (or after) make sense and help in exhaust flow for turbo application?