I got a chance to pick up a D&D Boarzilla pipe at a decent price. My engine is stage 2 but its only been bored .030 over so I would think its not much bigger than 80 c.i.
My question is would a Boarzilla work? I got a Fatcat on it now, I dont think that header diameter is that much of a difference. My Fatcat is 1.5 inches for the first 21/2-3 inches (that was a shocker when I measured it). I read somewhere Boarzillas start at 15/8. Im not seeing a problem with it being "too much" pipe. Any thoughts on that guys?

 

Reading material attached, most info is on bigger cube engines, little bit I read was the Boarzilla is loud - loud - loud.

Super Trapp, Old Propipe will school both D&D pipes BUT both D&D pipes will school the New Propipes and most other newly non adjustable pipes. You might be able to get some bottom end with a quiet baffle in the Boarzilla, without restricting it down some it is a lot of pipe for the little but mighty 80" +.030.


https://www.google.com/search?rlz=1C1KAFB_enUS512US556&biw=1280&bih=586&e i=_ORkW4qCOK3D0PEPpa-gkAM&q=boarzilla+vs+d%26d+fat+cat&oq=boarzilla+vs+ d%26d+fat+cat&gs_l=psy-ab.12..0i8i10i30k1.47719.59856.0.61807.26.26.0.0.0 .0.196.2637.1j22.23.0....0...1.1.64.psy-ab..3.22.2434...0j0i7i30k1j0i8i7i10i30k1.0.N2CYRpr RApo

 

Been down this road. For what ya got stick with the fatcat.

WP

 

 

Yes it is but a good one, the Dragos Dragula is based off the Wrath with a few tweaks per Frank Dragos, I run the Dragula with a 3" baffle, can hide a couple of Mexicans in it. Even with big cubes you loose some bottom end when the packing starts burning out and less back pressure so don't think big cubes is excluded from the right exhaust. Exhaust means a lot to a Harley but you can out think or not educate yourself and waste some serious coin, kinda like seats, works with one a$$ but not all a$$es.

Big picture, anything with a removable baffle can be made to work with understanding of how much back pressure is needed on your engine, make adjustments, make mistakes, make adjustments, make mistakes, make adjustments, happy, ride the heck out of it and leave it alone.

 

Thanks for all your replies guys. Still reading up on what "too much pipe" is.

 

It's somewhat similar to 'too much carb', or indeed too little for that matter. For an engine in a particular state of tune to give it's best it needs carb and exhaust to work just right and in harmony with each other. If the carb is too small it cannot deliver enough air/fuel and the engine is 'starved' at higher throttle openings. If the carb is too big it can be flooded - I've suffered both of those on my Evo Glide in the past.

A similar problem can occur with exhausts. An unsuitable one can restrict engine performance due to not allowing it to breath correctly. Some systems like the Boarzilla are made for much higher performance engines than yours. Will one work on your bike? Possibly. Will it work well? Unlikely. I don't have any experience of either of those systems, but the chaps above are suggesting your FatCat is fine.

Of course you could always get the Boarzilla and set it aside until you buy that S&S 124" you've always promised yourself!

 

 

Thanks again guys, all I can say is that with the way my engine is built, it runs great with the fatcat, my muffler is the 2.5 in. core perforated wrapped baffle. The header isn't really "stepped". Earlier I mentioned that it was 11/2 in. for the first 21/2-3 inches, I was wrong, it's more like for the first 11/2 inches or less, then 13/4 down to the collector. As long as I keep this engine I'll keep this pipe, sounds good not overly loud. Thank again.

 

I have a 2000 Road Glide Screamin Eagle stage 4 with a 113" including CNC ported heads, +.010 pistons making it closer to 114" with SE 264 cams. also currently has Cobra 2into1 exhaust
currently making 105HP and 113ft-lbs
I plan on adding a ThunderMax ecm, and probably ditching the Marelli for the Delphi throttle body.

Fatcat or Boarzilla?