I’m planning to delete the rear factory muffler on a 07 NA 4.2. Am I about to unknowingly make my car sound like a Mustang? Thanks!

 

Worse.

 

Uh oh! What would you recommend? Would like to increase/aggression volume but avoid the mustang sound.

 

XK/R-S back box. There are some differences inside. Course I don't know if they would work on a 4.2 setup.
Could open the muffler, move some pipes around, make it a real cool custom rumble.

 

Man I have been searching everywhere for an XKR back box but have had no luck. This was my first choice.

Wouldn’t deleting the back box basically be doing the same thing Quicksilver does?

 

I’ll cast a vote for the Mina Gallery system. I’ve very pleased with the results on my 5.0 NA XK convertible.

 

I have the Mina back box on my 13 XKR and like it very much. I also had one on my 5.90L NA and it was a major improvement over the stock box.

 

I purposefully set out to make my XK8 sound more like a Mustang. What's not to like about the original muscle car V8 rumble. 😀

Richard

 

Since Jaguar’s engine’s a variation of those fitted to Mustangs, it’s no surprise they’ll sound similar, in fact the 5.0 litre JLR version sounds even more like it’s Mustang cousin.

I’ve done a variety of variations of exhaust systems to mine. I’d say the best sound wise was the version where I substituted the resonators for an X-pipe and kept the XKR back box. The next version replaced the Jag cats with 200 cell which increased the output decibels. The fourth version replaced everything, increased diameter to 3-inches, added 2 X-pipes and replaced Jaguar back box with dual magnaflow resonators. Currently on version five (no cats) and working on version six.

For yours I’d try fitting an X-pipe and find a 2007-2009 XKR back box (sadly mine got binned at the welders). From there make other adjustments to suit.

 

I love the mustang sound! I just personally prefer it on a mustang lol. To each their own!

 

If you delete the back box and install an X-pipe and then get properly tuned
your XK will sound amazing.

 

Speaking of Mustangs I've got a Flowmaster cat back system on my '96. Sounds nice and throaty, nice low rumble. I have Magna flow muffler system on my '06. Sounds great, low rumble. I cannot stand the current exhausts with high notes, popping and cracking sounds. My XJS has stock mufflers and I would not alter them.Still, to each their own.

 

oooh yeah, lets throw some mustang pipes and widebody kit with a spoiler on the XK,
nevermind getting tuned, its about being noticed!!!

wait what was this thread about?

 

What tune would you recommend? I was recently advised in another thread that tuning wouldn’t be necessary with a simple x pipe plus muffler delete. I was told if I left the cats alone no tune would be necessary. But it sounds like you have information to the contrary?

 

Body kit would be just gross on an XK. But letting that low V8 rumble free is sheer heaven. It's already there but it needs letting out. The extra body work is not there and never should be. To each, his own. 😎

Richard

 

Tune is definitely necessary if you want your car to run properly.
basic air fuel ratio target tune will do the trick. I went with quantum

 

Is that the kind of a thing you order online and they do remotely or do you have to take it to a shop. Sorry if that’s a dumb question, I’m new to this. Thanks!

 

Target air/fuel tuning lets your ECU do most of the work so it can be done
after installing your exhaust system, drive for a few hundred miles and then
read the data from your ECU using a handheld device, send the file to them
and they retune based on your data noting your exhaust parts, they send it back
and you flash your ECU with the new adapted values.

 

Very cool! Thanks for the info!

 

If you get the Mina Exhaust make sure he's gong to warranty it.