What's the difference? How do they compare? Which one is more efficient? Is it worth it?

Lots of questions I know, but I can't seem to find many articles on it.

I mainly just want to get the jist of what both produce, pros and cons, how it helped or how
it didn't help in certain areas. I'm just a curious one I suppose. Any info would be greatly
appreciated.

Thanks!
Kathryn

 

A place to start....Hope it helps.

http://thunderace.scee.sony.co.uk/history/msg26463.html

 

I've used dynojet kits in some of my previous bikes and had good gains -- never used factory so I don't know anything about them. I'll give dynojet A+++ for customer service ... I completely gutted my 750Can-o-tuna's air box and put double k&n's on the intakes with a full pipe and jet kit. The kit wasn't really made for all the she-yat I did to it but the tech guys at dynojet got me real close on the first try.

 

What kind of gains? The more I read, the more I hear the factory jet kit is the way to go.
Why is that? It's a little bit more expensive but I hear it ups the power just right.

The only thing non stock on my bike is the RS-3 yosh slip on. I'm leaving it stock air filter
because I'm not a firm believer in the K&N. I just don't trust it, and I'm sure you could
debate it all day long.

 

25hp on an air-cooled 750 Kat.