I was thinking of getting an exhaust system and I have a 2004 California truck with a cat. I didn't really want to take the cat out just in case they start smoging or having inspections on the diesels down the line. Is it even going to do anything for me if I still have a cat? Also I looked around for a few minutes and I couldn't even find a cat back system.

TTS makes a CAT back system (I have theirs on my truck). They are located in Compton (near 91/110/405 interchange), which is close by Torrance. Stop by and take a look at Steve's truck. You can get a first hand look for yourself. It lowers the EGT about 100 deg F.


http://www.ttspowersystems.com/exhaust_gmdiesel.htm


Banks also makes a CAT back exhaust system too. I have seen it installed on several trucks and it is very nice also.


I am certain there are others to choose from.Edited by: OC_DMAX

OC_DMAX - Can you give us a comparison between the Banks and TTS systems? How does each sound and which of the two has the lowest noise level, best tone, least resonance ... Thanks in advance!

Yes, a little more info on trucks with a cat! My 03 is here in Texas, and was surprised to see the cat when it showed up here....http://www.dieselplace.com/forum/smileys/smiley3.gif

somekevinguy,


I would encourage you to check out our MBRP systems at www.dieselperformanceparts.com (http://www.dieselperformanceparts.com) We GUARANTEE all of our prices and all of our D-max systems start with cat back systems, we also have the cat test pipe if you want it. We have systems in aluminized, T-409 and T-304 systems. We also have duals if that interests you.


Mark @ DPPI

Is that pricing right? Double the price for the better stainless on just the cat back system? Now I am finding out that it seems like most the manufactures make a cat back system they just don't list them on their site. ie. magnaflow, bank, MBRP. That cat test pipe is very interesting though.

somekevinguy,


Yes and no, the T-409 is only 107.00 more the T-304 is 483.00 more and includes the dual wall 5 inch tip thats got a value of 65.00. So you can get a T-409 stainless for a pretty economical price.


Mark @ DPPI

Man that would be so cool to have that nice polished T-304 pipe under my truck but I can't believe it is so much more for such a short length of pipe. Also the fact that I live in California, I don't think I can justsify it based on the fact that it is more rust resistant. I think I will have to settle for the T-409.

Mark @ DPPI, I am also in the market and want to have one in place by next week. Can you please tell us pros and cons between cat-back and turbo-back? Also, the difference with the 4" vs. 5".


Which one would you put on yours?


Thanks, Jumper 357

somekevinguy,


The T-409 is polished as well, it just won't stay polished looking like the T-304 will. I agree in CA T-304 is overkill, now if you lived in Chicago or the like that would be a different deal!


Mark @ DPPI

Jumper357,


Cat back keeps the exhaust note nearly stock unless you have your foot buried in it, then you get a nice rumble! No cat lets it talk, just right for me, but for others that say it's louder than they might want. The current cats flow extremely well as compared to the older designs, so you will lose a little flow and have a slightly higher EGT if you keep the cat in place. For most folks that's OK, for the max performance guys it isn't. Here's the good part, get the cat back, try it. If you need more voulme or EGT reduction the front pipe bolts in with 4 bolts and a V band clamp, it's a PITA but you don't have to start all over and remove the whole system to install it at a later date. This way you can see what's best for you and your trucks mods and how you use the truck etc.


4 inch is good up to approx 500 RWHP, more than that get the 5 inch. 5 inch is boomy and loud, be prepared for it. We sell quite a few 5 inch, but it's less the 1% of our total Duramax exhaust sales.


Mark @ DPPI

How about the system that exits on each side. Will that seem any louder with the exhaust flowing out on the driver's side? I guess I want the best of everything - good looks, the truck to be as close to stock sounding as possible and also the performance benefit of an aftermarket system. I will be using this as a daily driver and tow vehicle so I really want to improve power in the lower RPM range where I will feel it everyday. Other mods will include upgraded programming (probably in the 90-120hp range) and a highflow induction.

davesmax,


The total volume is the same, but you will be able to hear the drivers sidea little more as it's will be closer to you as you drive as compared to a passenger side only exit. For 99% of customers you won't be able to tell the difference as a whole.


Mark @ DPPI

Sorry to bring this to the top, but I didn't want to start a new topic, just rehash the old one.

I'm wanting to do an exhaust, but don't really want to add any 'rumble' to the truck. I commute in my Dmax, and appreciate the quiet and the XM/Bose setup! I'd appreciate EVERYONE's comments on Banks,MBRP,Jegs, or whoever else 4" system. I tow once a month or so, but I have yet to tell myself, "man, I wish it had more power", not really an issue, but its nice knowing its there if I hook onto the triple axle gooseneck with two cars in it! I'm mainly interested in quality sound and then performance. THANKS!!

Oh yeah, my truck has the cat converter on it. Not sure why, I'm in Texas, and we all know that our current President is our former governor. He eased up alot of our emissions stuff several years ago.... I'm not worried about inspections, I'll keep the kitty, for the 'just in case'. Would it be to my benefit to remove it, or keep it for the sound deadening?

klvn8r

If you dont want a true performance exhaust sound, leave the cat in. I am here in Ca and have a cat back system. To be honest I was disappointed in the sound but after being explained that the cat was the major sound deadener I was OK. If you truly want the sound you need to remove the cat. If you do not it will be very near stock levels.

Eric

i put a stainless steel catback stainless steel magna flow exhaust for my gmc 3500 D/A crew cab duals 04.5 i got the kit for 325. and had monroe install it for 65 bucks it sounds healthier not real noisey it bolts on to the cat,the kit comes with everything u need and a nice muffler,put it on in dec 04 ,the same kit with a 5 or 6 in tip was 525 i couldnt see spending two hundred extra for a tip.

I don't understand why the system without the cat has to be really noisier. The LB7 did not have that cat (second muffler) and it was as quiet or quieter than my 2005 LLY with the cat (and stock). I know there was a cat for the LB7 in California but not for the rest - or am I wrong?

I believe all '04 LB7's had it but I may be wrong. I also believe that other states (don't know which ones) required the CA emissions package.

For the record, I believe any of the better systems are only slightly louder than stock and have a nice rumble IMHO when on it.