I LOVE Flowmaster 40's on V8s, and thought one would sound good on my XJ 4.0, I think it sounds like total s#@t, it sounds like one of those rice burners with a coffee can muffler. If I had to do it over again, I wouldn't go with a 40, probably not any flowmaster, but if you used one of the quieter, milder series it might not sound bad. Just my opinion, lol. I put mine on myself with about a foot piece of straight pipe after the muffler with a turndown on that. Good luck with whatever you do bud.