If you have w/h get the mounts thay take care of it I posted in the ether thead about the fix for the noise I will post a pic of the fix when I can but if you want to know how to do it let me know or email me or call me 480-510-3420 David

 

Cattman is on top of things. too bad Franken...can't be so up on what the customer needs or thinks. i will be ordering this y pipe along with motor mounts to try and avoid this lil problem. how much do the mounts go for?? maybe you could sell the mounts with the y pipe as a package Brian??

 

I have to agree that Brian Catts is very professional and a pleasure to do business with. I know when I was considering buying the Cattman Y-pipe for my car, he answered every one of my emails and responded quickly.

I think with any kind of mod...unfortunately you'll find some people who get a "less than perfect" product. I know that I'd be a little annoyed if I put my Y-pipe in and it was banging. Fortunately, it sounds like this isn't a common problem.

Hopefully, I won't have any problems when I put my Y-pipe in tomorrow.

 

Even with the banging, I recommend this mod. I am going to spend $30-$0 and get a 3/4 to 1" spacer between my resonator and the catalitic converter. I have updated my site to include new sound clips of the Cattman Y-Pipe with the PowertTech PT1011. The exhaust is louder now at WOT, but the droning is GONE. Click link in sif for soundclips.

 

i haven't run into any banging problems with mine but i don't have the stock b-pipe....know what size pipe is the cattman b-pipe? the one i made is 2.5" would i be getting enough backpressure with this size pipe? could this be why i'm not feeling as much power as the others?

 

c'mon guys, cut the cattman some slack. i guess i'm lucky, i have his y-pipe and cattback, and haven't had any major problems at all. when i did, he answered all my questions personally and professionally. can you say the same about steve millen?...

 

How can you say that t56gen3 or myself are giving cattman a hard time? Both of us have been extremely complimentary of his Y pipe. I knew that the pipe would probably bang because t56gen3 had it installed and it would bang. Even though it would bang on his car, he said that the power improvements made it worth it. My solution is going to be spend $40 at a muffler shop to have them extend my stock B-Pipe. I am not complaining or anything except stating facts.

Fact is, on 2 seperate cars with the stock B-Pipe, it bangs. You have pictures as proof. Cattman is no Stealin for darn sure.

 

hey bro, didn't mean to come off that way, but with the issues in question, cattman came out here personally to answer any questions, and he's made a ton of posts on this thread alone. as a businessman, i'm pretty sure he wants you to be 100% satisfied with his products.

 

Just thought I'd let you guys know that I had my Cattman Y-pipe installed today and there's no banging on my Max. There seems to be a little extra power w/ no additional noise. Hopefully, the gains will increase over time.

 

I went to a muffler shop and Saturday morning. I decided to go the cheap route for now and just had them install a small spacer (around 1") before the resonator. I now have no more banging and I am very happy. I still want to add an aftermarket B-pipe and mounts, but this solution works great for now. Here are some pictures in case your interested.

 

Glad this worked for you, though I'll point out that it solves an exhaust issue - the fact that it will bang on a hard launch - rather than a "short" y-pipe issue. We measured, bolt hole-to-bolt hole, and the Cattman Y-pipe was over 1/4" longer than a stock pipe that had been on the car for a few thousand miles (it is possible that the stock flexes will elongate somewhat over time, ours will not because the interloc lining flexes, but cannot stretch).

I can't tell you if the stock pipes vary in length, but our y-pipe manufacturing fixture does not allow for more than a few hundredths of an inch variance in the 3D positioning of the three flanges. The flanges are the first parts bolted in place and everything builds off of them, so that aspect of the contruction is locked in place, and they're all basically the same length. I couldn't be sure of the length till we measured it, but knew that whatever it was, they were all the same.

On my friend's car, he solved the banging issue by adding a very stiff exhaust hanger just before the muffler can. We spent a lot of time under that car, and determined with confidence (at least on his car) that the banging came from a front-rear movement and that there places where the exhaust had an inch clearance when the car was at rest, but was obviously whacking it pretty good when the car wheel hopped on a hard launch.

The engine tips back when you launch, I could swear that I've seen it rear back 4-5" on a dyno with the hood open (and stock mounts). That has to pull the entire exhaust forward an inch or more. So, there seem to be at least two preferable solutions, 1) limit the engine's movement (HD mounts) so the exhaust doesn't move as much in the first place, or 2) add a stiff hanger that limits and buffers front-rear movement, but doesn't prevent it. Stock rubber hangers (and mounts) are not designed for these stresses. They're wimpy because that's fine for "normal" driving and it minimizes sound and vibration transmission to the chassis.

Your solution also seems compatable with our observations -- by lengthening your midpipe an inch, you forced the entire exhaust back as far as as the engine was bringing it forward on launch. However, in terms of designing parts I would rather stick with more or less stock dimensions in order to avoid unanticipated consequences that could pop up when a large number of vehicles is involved (since each is dimensionally unique) and do something to prevent or limit the movement. Your solution prevents the contact by repositioning the exhaust rearward, and might increase the stability by putting more tension on the rubber hangers as the exhaust, but the actual movement of the exhaust system during launch will not change much.

Brian C Catts
Cattman Performance

 

Are there 2k2-2k3 dynos anywhere for the Cattman Y with stock exhaust?

 

Am I understanding this correct, that the cars with issues with banging are the one that still have the stock b-pipe? Does anyone with a greddy cat-back have this y-pipe experience the clearance issues? Thanks I really want to order this y-pipe but will wait until this problem is resolved. I do understand that with aftermarket modding there is a possibility of fittment issues , and for that reason I'm not knocking this product.

 

I would like to see some independent dynos as well.
It's the only thing preventing me from buying this y-pipe.

 

Sure, we launched the product with dynos in the first place.

1st run is a bone stock 02 Maxima automatic, 2nd run adds a Cattman y-pipe (torque converter didn't lock up till 3800rpm):



1st run is the same y-pipe run, 2nd run adds a Cattman mid-pipe (torque convertor hooked up properly on second run - mid pipe DOES NOT make 30hp)



Finally, I don't know what constitutes an "independent" dyno, but these were done by Godspeed, a tuning shop near Detroit, and I was in Tucson at the time. The owner of the shop was curious about the power it made and ran the dyno for us. We have no business connections... I'm not sure how much more independent it could get.

We'd give up on a project if we couldn't make good power, we wouldn't lie about it and sell it anyway, our reputation would be on the line. As I said at the time we released these, if the dyno hadn't been any good, you would have never known the part existed.

Brian C Catts
Cattman Performance