Fat Cat vs. Boarzilla
Thread Starter
|
Tourer
Joined: Jul 2006
Posts: 298
Likes: 12
From: Villa Rica, Georgia
Fat Cat vs. Boarzilla
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?
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?
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,070
Likes: 2,114
From: Ohio
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
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
Last edited by 1997bagger; Aug 3, 2018 at 08:52 PM.
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
All this technical jargon concerning exhaust volume paired to actual cubic volumes of a motor is intrigueing.
wowes me... My totally stock 103 ci twink is fitted to a wrath from Rush. Which is a whole lotta pipe
wowes me... My totally stock 103 ci twink is fitted to a wrath from Rush. Which is a whole lotta pipe
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,070
Likes: 2,114
From: Ohio
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.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
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!
Trending Topics
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
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.
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.
Would of gone with it, but the sound woulda been abit over the top. Tho I admit it woulda workedjust fine on mine
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Thread Starter
|
Tourer
Joined: Jul 2006
Posts: 298
Likes: 12
From: Villa Rica, Georgia
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.
6th Gear
Joined: Sep 2011
Posts: 14
Likes: 0
From: USA
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?
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?
Last edited by Old Soul 76; Nov 8, 2023 at 12:01 PM.