What are the pros/cons between C2, C4, and C5?

XX-TECH150

I am weighing differences on exhaust systems, I've done quite an extensive amount of research of sound clips and websites and prices, but to anybody with two bros exhaust, what are your opinions on the differing styles (C2, C4, C5) and what effect do they have (if any) on fitment and functionality for the bike and rider (and the ol' lady!).

Secondly, What difference does it make if I get a full system or just slip-ons? I heard it's best to re-jet no matter what. Can anybody help me dispel or confirm any of this as myth or is there road proven fact behind it?

Thanx, D

flitemdic

The engine in the Blackbird is working optimumly, (sp), coming out of the factory. That isn't to say it's makng the absolute most HP it can, just that it is working at the top of it's design parameters. Once you start modifying things, the best results are gong to be seen if you modify all together- top to bottom, etc. So, if you modify the exhaust, you need to go all the way to get the best results. With what you're proposing, a slip on will only give you part of the best hoped for result. If you don't rejet, you are getting even less benefit. If you use a full system, but don't rejet, the engine will again not be operating at an optimal level. Your best results are going to be found when you get each part working together. If you lose any part, the other modifications aren't going to be working at their best. Look at any review website that deals with your various mods. Mostly, they will have dyno charts that will show- "with one modification, with two mods, with three mods- etc." There's always more horseys to be found with full mods rather than just going part way.

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N2YN 8/22/2004

lois

Here's one proven difference...

I own a 01XX Red (the fastest color) my buddy owns an 02xx(silver...slow color)
Anyways buddy with 02 (stock bike) me on my 01 (stock) get it on. He pulls away from me. He weights 200Lbs, I weight 310lbs.

He, (02XX) puts on a PCIII & slip on's, now he kills me, pulls away, and leaves me behind...way behind.

SO....

I (01XX) add a PCIII and......a full 4-2-1 Yoshimura race system.

Now................

I can run dead even with him, He can not pull away from me, I weight 100Lbs more than he does......

In answer to your question, and, as flightmedic pointed out. I believe that had I only just installed the PCIII and slip on's , he still would be faster. I, however took the plunge and went all the way with a full system.

In my case, It made a big difference on my bird to put the whole system on....don't go half way yourself....

Lou

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RED IS SIMPLY THE FASTEST COLOUR

haWHYnXX

Only difference between the C2-5 is size and shape - NOT functionality. C2=small oval, C5=big oval, C4=round. If you prefer round, obviously C4, but if you want to go oval, you need to decide if you want smaller or larger. Most prefer a larger oval on a big bike because it's size just looks better. Either way, the inners are exactly the same (same power, same sound, same dB).

+2 on previous answers. Maximum performance go with full system and rejet. However, you can just go with slipons for some extra horsepower plus a whole lot of shredded weight - stock cans are HEAVY.

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-Vern

Hawaiian Island Stylin'