I'm getting an exhaust system for the H22. A custom SMSP header. Test pipe, then the cat back. I'd like to get maximum gain while maintain the quite. I know it's impossible, but of these choice, which one would you guys suggest?

1/. Apex'i WS2
2/. RS*R Exmag
3/. Greddy SP2
4/. 2.5" mendrel pipes with Magnaflow Resonator (22" long) and Magnaflow Oval Muffler. All are 2.5" straight through.

Options 1-3 have 60mm pipes while my header has 2.5" collector.
If you choose #4 setup, which muffler would you get?

a. Stainless oval 5"x8" @ 18" long then weld a tip on the 2.5" outlet



b. Stainless oval 5"x11" @ 22" long then weld a tip on the 2.5" outlet



c. Stainless oval with tip, cut the 2.25 inlet and weld a 2.5" to the muffler 2.5" internal core:

this muffler has 2.25 inlet, BUT with a 2.5" core, and a 7"long, 4"diameter tip.


Edit: Mods, can you help me add a poll for the following options?

1
2
3
4a
4b
4c
Others