HKS Hi Power Titianium or Stillen Exhaust? Which will add more horespower/torque? Any personal experiences or suggestions?

 

I personally like HKS HI-Power... Love the sound... Performance gain is similar thats why i went for HKS

 

Yes, I'd like to know also. A buddy has a HKS on his s2000, sounds incredible at WOT, nasty and intimidating! I know it's a different car, but it's the only after market exhaust that I've heard. Definetly not a ricey fart can

 

Stillen all te way.....gains are incredible

 

^^ but it's also one of the heaviest exhausts on the market. My vote goes for the HKS