Exhaust Decisions..

[apmurphy]

I'm in the process of laying out a new exhaust design for the truck. Right now i have the 4.0 running a $20 CherryBomb glasspack bolted onto the scrawny 2in. pipe that came on the truck.. It's alright but sounds like a ricer to me. So i want to upgrade to new headers, high flow cat(s), and Super 44(s). I need help deciding how to lay it out- true dual or merge to the muffler and dual exit? True dual would keep the sides seperate- 2 cats, 2 mufflers; and the merge/split would connect right after the headers into one cat and one dual exit muffler. Anyone know what would sound better or what would be better performance-wise? I pretty much want it as loud as possible but dont' want to take away any power. I was also concerned about using one cat if it would compromise the emissions. I think there's like 3 on there now which is a bit rediculous but yeah, thanks.

 

[93_RangerSC]

well if yall dont get tested for emisions where you live just dont put cats. i have true dual super 40's and no cats sounds perdy good IMO perdy loud to

 

[Wicked_Sludge]

his truck is post OBDII, meaning he has a cat efficiency monitor. removing the cat converters will trip a check engine light. not to mention, tampering with original emissions equipment is against federal law and is punishable by a hefty fine.

murphy: there isnt much you can do to the system to increase performance. you factory exhaust is already tuned and sufficient for your engines needs. even headers are going to have a very minimal effect since your factory manifolds are sort of a manifold/header hybrid and they flow decently.

running true duel exhaust is going to be difficult with the post-cat. sensor...since there is only one. if you do run true duals, you need to run an equalizer ("H" or "X" pipe) to avoid killing your bottom end power. you might be able to place the post-cat O2 in the equalizer pipe.

im not a big fan of split dual exhaust. it adds the weight, cost, and complexity of true duals, but it sounds the same as single pipe. you'll also get that "smoke out of one pipe" thing on cold days.

if you run true duals, i wouldnt go over 2" pipe. for single/split: 2.5" pipe.

 

[doorgunner]

Wicked---I did the fake duals---put a splitter behind the new cat(you convinced me about the cat)--ran straight right&left pipes around the spare tire & added harley d. chrome m ufflers(pic.s in "just plain stupied)---sounds just like a '60's 289c.i. engine....who'da thought

 

[ghost_rader]

if you run true duals and are looking for performance, the two pipes need to be exactly the same(same length, same bends, same everything) that tends to be hard with a gas tank in the way. That being said, plus what wicked said is mostly true. I built custom exhausts for just over 8 years and if you want to go all out, you can. for the performance and drivability, i would do headers with a y-pipe into a single high flo cat(keep all O2 sensors in the correct locations pre and post cat.) then split it with a single in dual out muffler. (good ones have the proper flow dirverters to make it smoke out of both tips). i would stay with 2" to 2.5" pipe going into the muffler. you can come out after that with any size you want, the back pressure is already achieved pre muffler.

if your going to do this your self, talk to a muffler shop and ask them what cat they suggest to replace your factory one so that your ses light won't come on for a cat efficiency code and make your truck run like crap.

hope this helps

 

[apmurphy]

hey thanks all for the info, k think i might just do the catback with a single in/dual out muffler and maybe 3 in tips or something. damn computers in vehicles...