Rush Big Louies
Tourer
Joined: May 2013
Posts: 362
Likes: 13
From: Okinawa, Japan
I had a catless header with 2.5 baffles and it was a nightmare to get it tuned correctly....if you remove the cat Rush recommends 2.0 baffles for no cat.....since I changed them the PV tune they loaded and a few auto tunes run and now it's golden...changing from 2.5 to 2.0 hardly did anything to the exhaust note...it actually sounds better, a bit lower growl and no drone at cruising, no decal pop.....I also installed a Cobra PowerPorts system, great exhaust...with that change it definitely reduced the leg burning effect on the right side, my GF says the rear heat is almost gone completely.....
Last edited by damquick1; Mar 30, 2017 at 06:29 PM.
Road Warrior
Joined: May 2012
Posts: 1,388
Likes: 132
From: Baltimore, MD
I've got 2.5" baffles in my BL's on my 2007 RK (no cat head pipe). I had no idea I had no packing material in them until I bought material and went to repackage them. Yes, you read that right. Lol.
After repacking with 2 layers of fiber material the pipes sound crisper with more clear bark on accel. They probably are a little less loud overall but the only way I can tell is that I can hear my radio a little better. Otherwise, it sounds the same (but better, like I said).
I can't imagine running 3" with no cat. There'd be no back pressure and I think the bike would perform horribly.
After repacking with 2 layers of fiber material the pipes sound crisper with more clear bark on accel. They probably are a little less loud overall but the only way I can tell is that I can hear my radio a little better. Otherwise, it sounds the same (but better, like I said).
I can't imagine running 3" with no cat. There'd be no back pressure and I think the bike would perform horribly.
I have the Big Louies with 2.5" baffles with cams and a 107 Big Bore and it is loud but not ear splitting. Best sound after trying about 6-7 other slip-ons. I would call Rush and ask them the best performing baffles for your bike. When I had the cams without the Big Bore Rush recommended the 2.25" for best performance.
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