Just got my Cattman Y-pipe and Frankencar B-pipe installed today and the sound was much louder than I expected. I have the Cattman Rear Section too, and the sound is wayyy louder than with just the rear section. It's a lot deeper, which is good, but raspier too, which is bad. I'm not sure if I like it... Will the exhaust quiet down after time?

I really didn't get to drive that much cause the weather is really bad, so I can't say if I feel any difference performance-wise yet. I'll update tomorrow. Also, regarding drone, all I can say is the exhaust is a lot louder. You can definately hear it in the cabin, much more than before, even with the music turned on. I hope it'll quiet down....

The bad thing is that I got both parts installed at the same time, so i couldnt hear the difference each piece made. I'm guessing the y-pipe made the biggest increase in sound but the B-pipe also has a much smaller resonater than stock so that probably affected it as well. Anyone else running this same set up? Comments/suggestions appreciated.

I guess it'll just take some getting used too. Hopefully the performance increase will pay off...

 

Sublimer.

I had the same issue when I installed my Headers and Catback at the same time. You will get a raspy drone from your exhaust for a week or 2 until some carbon builds up on the inside. This carbon will help quiet down the exhaust and provide a nice acoustic effect.

The sound will be mellow and enjoyable soon, just hold out!

 

Ahhhh thanks! That's what I needed to hear.

Also, I think heard some knocking down there....I'm gonna have to get that checked out...are there common problems with the pipes hitting things?

 

Yes - Aftermarket exhaust systems typically have close tolerance with the surrounding frame. If you are hearing knocking its most likely the B-pipe banging on something due to missalignment.

I had a washer welded onto my B-pipe hanger to move it over 1/2 an inch to stop it from banging. Put it up on the lift to see if this is the problem, and resolve. I suggest aftermarket hangers. Frankencar and Cattman exhausts arent the lightest and the OEM hangers will not stand up to the weight.

 

hmmm ok ill have to check that out. I'm actually taking it back to the shop to have them replace the bolts on the cat heat shield because they broke off during the install and they didn't have a drill to drill them out. I'll take a look when its up on the lift. Thanks.

 

I just installed cattman headers and waiting for my Cattman catback exhaust. How loud is loud?

 

well i have the cattman y pipe and full catback exhaust from franken car and its not even loud. its prob. the cattman rear section

 

yea im thinkin the smaller resonater on the frankencar b-pipe and the cattman rear section def make it louder. I don't think anyone else has this set up....

Also, regarding the knocking, its really bad. I hear it all the time, sometimes when the car is barely moving. I'm pretty sure its the b-pipe scraping something, but I'm gonna take a look at it tomorrow on the lift. Anything specific I should look for? Any particular hangers that should be replaced? Also, where can I get aftermarket hangers?

 

The best thing you can do to reduce noise is most likely to go back to your stock muffler. I have HS Headers, CM Highflow Cat and the Cattman Cat-Back and it really does not quite down that much more over time... I think you kinda just get used to it.

The Y-Pipe is what really made your exhaust sound increase with the Cattman rear section. The removal of your pre-cats adds quite a bit of sound. I noticed a difference switching from a stock cat to a highflow cat let alone removing one.

The Cattman rear section does sound really nice, but it can get really annoying in the cabin.

 

I removed the two exhaust supports after upgrading because the exhaust was banging them... I have had no ill effects.

So I am clear, here is a pic of the two I removed:

 

I just got my Cattman Y-pipe installed today, and yeah, its
actually A Ton louder than I expected, I also have the HKS rear
section and its made that ALOT louder.
I like it, don't get me wrong and I'll love it even more if/when some
of the drone decreases.
Its odd, sometimes it feels the same as before, and others it feels
largely more powerful, Torque steer has definately increased as well
as loss of traction in 2nd gear.

I also installed Progress Springs, KYB-GR2s, Progress Sway Bar, and
FSTB.
The suspension is incredible, Ride, Handling I Love it.

Markus.

 

Yeah I was thinking that but my stock muffler looks like crap....it's the AE muffler with the two ugly tips pointed downwards. I might eventually try to trade my cattman for a frankencar muffler.

Also, it's not really the loudness that bothers me that much, its the raspiness, but rbrown said that should eventually go away, so hopefully he's right.

And yea, the Cattman rear section sounds great alone, but with the other exhaust parts it just amplifies the sound more and sometimes can get annoying.

 

Yeah thats exactly where i thought the b-pipe might be rubbing. I might end up just taking them off like you did.

 

as for the knocking, here's a few things you could look for that may help. my buddy fixed an exhaust leak (he is a mechanic). he was just looking at the pipes and lifting it fand wiggling it for quite some time. but he told me it was because he has to properly tighten the bolts and it's important to tighten it a certain way to avoid any knocking. basically, try aligning the whole b-pipe by trial and error... each car is different.

for my car, he told me to lift up the middle of the bpipe and he tightened where it went over the rear axle first, then tightened everything else. that worked. not to mention, my hangers are WORN out, and he dind't even replace that.

 

I had to opt for a stock muffler when I upgraded to a aftermarket y-pipe and frankencar b-pipe. This is most bearable for me because it would be quite costly to experiment by buying an aftermarket exhaust and then not wanting it.

Its really a matter of preference and a big difference is if you are auto or manual (it drones differently)

 

Most cases it will not rub against the large crossmember. Read above. have them weld a washer onto the b-pipe hanger and it will move the exhaust over so it doesnt bang on the exhaust tunnel.

 

It did not bang untill I installed my HS headers, it was fine with just the cattman cat-back.

I removed the rear one soon after installing the cattman cat-back.

 

the cheap exauhst hangers off ebay are awsome, i had bad bangin issues with my frankencar, poped these on, all fixed. theyre the red or blue ones. sorry for no lnk.

 

Walker Exhaust also does polyurethene exhaust hangers. 3 bucks a piece.

 

Ok here's an update on the situation:

Turned out the pipe was banging on the exhaust tunnel (where the rear section starts to go up and then connects to the B-pipe). To fix this, the mechanic just bent one of the muffler hangers and that moved the exhaust over to the right about a cm and fixed the problem. Also, the B-pipe was banging on the smaller bracket closer to the rear. He just took that off and hammered it down in the middle so that solved that problem. After driving for a while, everything seemed fine until I noticed that over large bumps, I still hear some noise. The side to side banging is gone, but when the exhaust moves up down it still hits. This weekend I'll crawl under and check it out. I think the smaller bracket just needs to be bent a little more, or just removed completely. I don't think the exhaust would hit the larger bracket. I think I'm ok without replacing the hangers...

Also, performance-wise, the car definately pulls much harder abover 4000 rpms. Didn't really notice any difference in low end power. Bad news is i can no longer hear my Berk...

 

you should either go back to stock muffler or get frankencar its really quiet, it should sound nice with your y-pipe and b-pipe. not so raspy but mellow.

 

yea I'm considering going with Frankencar....maybe I can trade my Cattman for Frankencar muffler straight up with someone. I'll see how this goes for now.

 

Someone should convince Frankencar to have a trade in program for people that need to quite down after headers/ypipes...

 

Just get the damned hangers already!

 

haha i like bending stuff more...soon enough i'll get it perfect.

 

I put clamps on all of mine and it still was banging... hangers seem to work for some, not for all...