Straight Piped Exhaust

[Bugman123]

I have A CAT also

[Mopar1973Man]

We here in Cali will be missing out on the good stuff, can we say C.A.R.B.

I have A CAT also

Man your all screwed up arn't you... :confused: Well I'm sure if you did there has to be goodies for your truck and keeping it smog legal... Or the other way is to have 2 exhaust systems. Stock one for CARB inspections and the performance one for the rest of the year...

[NBWW]

Has anyone looked through one of these cats?I have always expected the are straight through, but would like to know for sure.

[flagmanruss]

The SS system I put on... one size larger from the turbo back... it came with a muffler. The muffler is straight through with just a few louvers in the pipe. But it is a "muffler" for those places that require one, and it's SS also so it will not rot out quickly. Being full diameter all the way to the tailpipe it is much less restrictive than stock where the tail pipe was 1/2" smaller diameter than the head pipe. It has plenty of bark...Russ

[Cummins2001]

Would you say a 4" is better or a 5" pipe? I like em loud. Dont bother me one bit. Right now I am running a 3" straight pipe. I want to upgrade but not sure if I want a 4" or 5" pipe. I do want to keep the drone down. What are the pros and cons on these 2 exhaust systems?

[Mopar1973Man]

4" is usually easy to install and fits with your spare tire... 5" I heard can be rather difficult to fit and some have had to remove there spare tire out from under the truck. Now as for noise... I've heard many stories... But I think the 5" is louder than 3" or 4"... IMHO...

[flagmanruss]

I really like the sound of my exhaust (4" turbo back, full length, straight through "muffler") running light... However, the new-to-us 30' camper has all the aerodynamics of a brick. Under load, the noise in the cab makes conversation impossible except by shouting. Shouting did no good because wifee was wearing ear plugs on the return trip. I'm going to have to quiet it some.

[kevin]

I don't know if this the right place for this question, but I read in another thread that the turbo on a 24v has a small 9cm outlet and this could be replaced with a 12cm. a buddy of mine has a 96 12v which has a 12cm stock. He said that a 16cm is the ideal size anybody know the veracity of any of these statements?

[Mopar1973Man]

The HY35 Turbo has a 9cm2 exhaust housing... The HX35 Turbo has a 12cm2 ehaust housing... A 16cm2 exhaust housing would be a good upgrade for someone around 450-500 HP. It would bring down the EGT's. But upgrade to early and you'll have a laggy turbo and lots of smoke. Remember it takes fuel to spool a turbo.

[guesswho512]

isx....show them your exhaust and tell them what you paid

[guesswho512]

here they are...if memory serves...thats a 70" from a semi. 5" in and out. close to the trans but still has room