Jeep 4.0 in 69 Barracuda

txstang84 said
Ehh, I wouldn't say that-as a matter of fact, I'd straight out disagree...I've seen it a few times where complete new free flowing exhaust required new jetting, whereas your factory fuel injection system will use adaptive strategies to figure out what fuel injector duty cycle to use based on the exhaust O2 readings under all sorts of different throttle and ambient environmental conditions--EFI is cool that way.

All that being said, again, I'm not trying to convince you one way or the other...just giving some perspective.

X pipes can be a help, and usually smooth out the tone in the exhaust.

As for the house-congrats!

I would agree with your EFI thought if I was running ODB2 out of a TJ or newer (97+), or if I was to run a MegaSquirt which does self learn and computer programmable, but the ECU I am planning on running is a ODB1, has no re-programmability, and does not learn. It adjusts based on tight pre-set variations.

I appreciate your providing perspective. I worked at a couple of local Brake and Muffler shops for just under 10 yrs in my late teens thru 20s while I was working out my life and trying to make college a priority. Your perspective is the same thought I am battling myself with how best to build this car. At this time, I dont think there is much I can do till I start dropping the engine in and taking measurements.

RustyRatRod said
Inline and smaller V8 engines generally perform best with some sort of HP single exhaust.

vntned said
Single 3" would be the way to go!

At this point, I know that I can always goto a Single 2.5 inch Flowmaster setup which would result in great power and a even better tone. Many the Cherokee's, Grand Cherokee's, and Wranglers have ran this setup. If I can make a dual setup work, I am going to attempt it. Which if I do end up attempting will make for some great reading (and YouTube video's) to be posted to this thread.

Thanks to everyone for the great insight. These conversations make for a good platform for learning. I am getting more excited on starting this project and seeing what it come out like.
John :D