Probobly would have kept my XJ if it had the 5 speed.
The darn auto is geared so low it howls at 70. 4,000 RPM if I remember. 4:10 gears didn't help either. Supposedly it has a 4th gear but I never felt more than 3.

The exhaust work helps a little not worth the cost in the long run unless you get from a wrecking yard. Sounds cool I guess but you'd get more mileage out of some skinny 31" street tires pumped up to 50 psi. If gas keeps going up we'll all be riding motorcycles anyway.