Does anyone know which exhaust of the two has more hp gains?

 

It's exhaust..
Won't give you much gain, go with either one.

 

Yeah, exhaust is more for later, when you really get power. It should feel faster, a little bit.

 

i would imagine they have similar gains but the greddy is built with much better steel, hence the difference in price. the apexi ws2 has a stainless muffler with aluminized coated mild steel for the b-pipe, whereas the greddy is full t-304 stainless. the highest quality.

 

The WS2 is chambered so it isn't going to flow as well, hence, it will hold you back from generating your peak power.

Then again, simply bolting on an exhaust system doesn't really do anything without the appropriate header and cat.

 

i thought sp2 was a chambered exhaust also.

 

Well if it is, then both exhausts will hold you back.

Flow, best to worst:
-Cannister/straight-through (N1-style)
-Twin-loop (Mugen/Hytech)
-Chambered (stock, WS2, etc)


Exhaust noise, loudest to quietest:
-Cannister/straight-through
-Twin-loop
-Chambered


As you can see, a chambered exhaust flows the least, but is the quietest. An N1-style exhaus tis the loudest, but flows the best. The twin-loop systems tend to be a balance of the two.