Are there any side pipes for sale that DON'T eat HP?

[Rare Iron]

Originally Posted by CHANMADD

If the little louvres face forward...(the opening facing airflow) .....it will be quieter and use some horsepower....if they face back ..its louder but less power loss....

If you go with the 3" core, the small louvers will not rob much HP at all, same with the 2.5" versions. The 2.5" versions are significantly quieter. If you go OVER the louvers vs. into them, loudness will go up approx. 4 dBA's.

QUOTE: The thing that finally tilted me towards the SS muffs over the Cobra Packs is that the SS mufflers are a perforated core design so I didn't have to struggle with which way the louvers should go.

Keep in mind, different types of perforations will produce different sound as well, so will the type of packing used. I've also had numerous customers tell me that 304SS pipes will create a "ring" to the exhaust note. Annoying to some, but not to others. I can't build mine out of stainless - heavy 16 ga. aluminized only.

[fordracing65]

One thing I noticed when I was at Kirkham was that the mild steel exhaust was almost twice as heavy as the stainless, plus I think stainless is a superior metal. I have heard a slight ring with some stainless but not with the Kirkham stainless. Don't know if any hp difference from the 2 metals...

[Ant]

I am in the process of building my side pipes, using 4.5" OD case, and 3" ID which is custom made stainless pert. I would like to think there is virtually no hp loss, although it will be noisy.
There will be a 2"OD insert for the road wrapped in sound deadening glass, this will really choke the hp and will hopefully get me past the 95db certification limit....