Just wanted some input before i jumped the gun and get an exhaust system but what exhaust would you recommend for a 07 Si? I'm kinda looking for deep acoustics but not annoyingly loud like a HKS hi power

 

Ktuned 3", Full Race 3" or Thermal R&D are all deep sounding exhaust that make good power also. Add a Skunk2 Alpha header and you are set.

If you want something a little more quiet you can look at the Invidia Q300. You won't make as much power and it's not as deep/loud as the other 3 but it's louder and deeper then stock.

I'll be going with the KTuned one myself with the Alpha header this winter.

 

Full Race or nothing.

 

Wrong Full Race or Thermal or Ktuned is the same exhaust