If you spend good money on a set of slip ons and leave the cat in there, you'll barely hear a difference in the sound. I'm not telling you to take your cat out, especially if you're happy with the performance, but you'll never get the full sound from any slip ons if you leave it in.Are you saying they did a good job sizing the cats to flow well enough? So the only benefit is a cooler exhaust? Sounds like the cats are staying on my bike.
They sure do. I remember when I first saw a couple 2010 Ultra LTD's, one was bone stock and the other had Rinehart slip ons installed. There was very little difference in sound between the stock one and the Rinehart equipped one. The only thing I noticed was the Rinehart equipped one had just a touch deeper tone, volume was pretty much the same.Thanks, I understand that the cats do a good job canceling noise
OK a seat of the pants evaluation only but after removing the cat the bike seemed to run a little cooler and maybe a little better. Then I added the Rineharts slip-ons and I was definitely impressed. I know it's not a dyno but the performance was definitely improved with the slip-ons. I know most people will say it's just because they sound louder but the torque was much improved on my 2011 FLHTK.I've read there is no HP benefit removing them using the stock pipe. Others say there is. Has anyone dynoed their bike to prove otherwise? It's a lot of work to get them out. I know the heat advantage, but would like to know the facts.
You are correct. Slip-On mufflers alone will "improve the performance". About half of the performance gains are from the mufflers and air cleaner and the other half is from a properly calibrated ECM. The slip-ons will also increase the exhaust gas temperature resulting in higher engine temperatures.... the performance was definitely improved with the slip-ons. I know most people will say it's just because they sound louder but the torque was much improved on my 2011 FLHTK.