most of the systems made for TJs are pretty easy to install with the clamps and stuff. personally, i prefer a welded exhaust system. cost more to do, but there are less issues down the line.
the borla exhaust isn't very loud, but has a decent sound. a dynomax or flowmaster muffler are going to be louder and deeper if that's something you're looking for.
economy-wise, you probably won't notice much, if any difference in mpg savings.
power, you might notice a little seat of the pants power.
I have been running the Borla catback for about 3 years with no problems. I would not recommend ths Borla header tho...like Tdad said, it is over priced and has some fit issues (especially in the 97 to 99 years). Just my .02
the 40 is going to be a bit louder, and probably have a better tone overall. to get a similar effect as the 40 series, the 50 series really is best on a larger engine.
there are better mufflers out there, but flowmaster like other product brands are household names and usually get the uneducated vote. people buy brands they hear a lot, even if it's crap such as sony products. flowmaster isn't crap, but it's not the greatest thing since sliced bread. i'll tell you, i'd buy flowmaster before i bought borla though.
i got a 50.. I have the stock tailpipe on but its quite low. If i had the choise i would get the 40 since its a bit higher pitched. As loudnes goes the tailpipe makes difference in that. Shourt pipe will be really loud. When i installed my 50 delta i did not install the tailpipe and it was loud enough to shake my seats at idle. The only problem i had with my muffler was i had to cut the stock tailpipe off since i couldnt get it out and also the clamp in front of the muffler (by the catalystic converter) in preatty bad shape so i had to cut it and then had to use a tool to rip off the stock muffler since it the clamp was so tignt on there it actually deformed both pipes with little humps.
50 delta muffler with stock tailpipe - all 3 movies are different
yes the 40 is a bit louder but its also higher pitched.. the lenght of the tail pipe can also control the loudness of the muffler.
The 50 delta is lower pitched so its deeper and a bit quieter but if you dont have a tailpipe installed it is loud as hell.. i didnt install my tailpipe when i first installed my delta so it shook my seats at idle so it was way too loud and was probably going to get a ticket so i installed my stock tail pipe, sometime soon i will install a 2.5" tailpipe that i have laying around and ditch the stock 2.125 (1/8)".
If you want your muffler to be loud you can probably cut your stock tailpipe and it will get a bit louder with stock muffler but i dont know if it will sound nice..
Yes 4.0 is a big engine.. let say you install a flowmaster on a civic.. it will sound like crap.. i used to work right next to a tune up shop where guys installed turbos, nitrous, exhausts, all sorts of goodies on sports cars and they make a civic sound better than z350s and infinities, they also made a 240sx sound like a corvette lol Many people say oh civics normally sound like crap.. well thats only with a ricers can.. if you get a quality catback instlaled it sounds perfect althought people will still say its crap just because its a civic.
Id say anything bellow 3.0 or is not domestic design shouldnt have a flowmaster.. domectic cars are made to take in fuel (same strategy since the 50s) no matter what so they sound good while foreign cars are made to be more economic so many use way different systems than american cars have therefore flowmaster on a japanese sports car sounds like crap. Keep in mind that japanese sports cars have smaller engines (6 is preatty much the biggest engine they use) but they are light as well to make up for it compared to the V8 4k lb corvettes
other than backflow pressure, does the diameter of the tailpipe affect the sound? for example, would the 50 delta become louder with a 2 1/2" tailpipe opposed to the 2 1/4 or 2 1/8"? and the same goes for the 40...
i checked out the flowmaster website and noticed that there are different inlet/outlet set-ups. which one would fit properly?
I will let you know as soon as i install my 2.5 on my delta. I'm preatty sure it will be louder but i dont know if the depth will change.
Bigjeep i used to have a 1.8 Miata before i got a wrangler.. i had a cat back on it with dual tips.. it sounded great actually. It really depends what you like so.. I bet you got the impression that a 4 banger engine sounds horable because most of the 4 bangers are ricers with cheap coke can mufflers you find at autozone or pepboys. When you see a good catback (not just a muffler in the end) you will see what i'm talking about.
Both are 4 bangers
Miata I4 - Goodwin Racing's Roadstersport 2
The stock setup on a wrangler is single 2.25" center intlet and single 2.25" side outlet. I know eventually i will replace the catalystic converter and tailpipe with 2.5 so i got a 2.5 intlet and 2.5 outlet and am now just using adapters to make it fit right.
so if i were to order a flowmaster with 2 1/2" inlet/ outlet and i wouldn't have a problem with the fitment? even if stock pipes are 2 1/4" from the cat back?
sorry about all the question....
guess i'm a bit anal and would hate to go thru all the bull$hit if i were to order the wrong part.......