I had Rinehart 4.0 slip ons and they sounded good when someone else was riding my bike. I could really hear the sound then but while I was on the bike I didn't care for them. I put a Thunderheader on (of course, always been a TH guy) and I love the sound while riding the bike. It's louder than slip on's, but I like it. I don't play the stereo or try an d talk to the person riding next to me. Not any louder than the guy going down the road blasting his radio loud enough that he can hear it. But just as many people will hate the TH so there ya go. To each there own and there is just no way to ever answer the question of which sounds best.

 

 

So I have a 114 and not sure if a 107 would be the same but With 114 it's assume! Not only did I not loose any bottom end, I gained a ton of snap on the bottom end and revs much easier to 5k. Now, I should say I did the TH, Heavy Breather and Vision II with Fuel Moto canned map all at the same time from just slip ons.

I wouldn't hesitate to void the warranty and make the same change again. The Billet Cat might do the same thing but I just don't care for the sound. Tried it a few times and just never made we go wow.

Having Zippers 468 and a Dyno tune done Wednesday. I will have before cam dyno and after cam dyno done to compare the two. Didn't get dyno totally stock so can't say what those numbers are but I was really impressed. Wife and impressed and she is usually clueless and power.

 

What's y'alls opinion about this? Is this just as good as purchasing a new head pipe? This will save me $500-$600 if the performance is the same.

 

Probably better off going with a new head pipe from Fuel Moto.

 

 

I am going to try this. I cannot see paying 500-600 just for a pipe.

 

There is no reason to cut the stock header to remove the cat. I used this drill bit, $14 buck from Home Depot, https://www.homedepot.com/p/Bosch-1-...005T/204415336. I allows you to drill all the way through the cat. Drill holes as close as you can to each other around the outside edge until you can collapse the cat and pull it out. The pipe can stay on the bike, in fact probably easier to do if it does because it will be stable. It took me about 30 minutes to do this. I then took a long burr bit and cleaned up any cat debris left on the pipe (it will probably blow out as you ride anyway) and radiused the outlet to the left side so it didn't extend past the wall of the collector. That was something Steve Cole asked me to do before we did cam testing last year. This year I am going to a Fullsac X pipe, so we will see how that works.

 

I drilled out the cat on a stock muffler, no need to cut and weld. Just keep drilling and collapsing it. You got to hook it with an angled rod, and keep pulling.
I did not notice a big change in exhaust note. Not really worth the effort in my opinion.

 

I've seen a bunch of guys remove the cat and the same look of disappointment on each of their faces. No improvement in performance and ZERO addition to noise output.

I'll give the best advice I can. Keep your stock system stock and change out the entire system with head pipe. Just in case say 3-5 years from now your state decides to comply with EPA mandates for motorcycles and the cops start pulling you over for loud exhaust, you can simply install your old system back on and get the ticket written off.

I've found (sound wise) nothing beats a transfer over to TH system. Gives you more TQ on the bottom and the sound is about as close as you will ever get to the old twinkie or evo. These motors are designed around exhaust noise and so you really need to get in there and change it up with either a cam or full exhaust to get the note you're looking for and remember.

Just my 2 cents.