I would like to make my 2001 xk8 exhaust just a bit more aggressive sounding

 

Lots and lots of threads on this subject.

I removed the before axle cans, like it just a tad louder.

 

the easiest, most effective change is to remove completely or change the rearmost boxes. Do not mess with the center setup as it will sound horrible and probably decrease performance unless you have a system designed by people who have the engineering background and experience to do this. additionally it helps if the proposed system is side by side tested on a dyno. If you modify the rear boxes, you might want to reinstall the before axle cans or it will sound too gritty.

Another thing to note is that larger diameter pipes do not make a large difference in HP or power curve until you reach much higher displacement.

 

l have the mina gallery under axle system. Deletes the box immediately to the front of rear axle, sounds just right to my ear.

 

I removed the rearmost mufflers. Sounds great on full throttle.

 

Interesting that I have been researching this subject the last couple of days. I have seen two different ideas, both here and on YouTube. Remove the two rear mufflers or the center ones. I find no mention of problems with the O2 sensors, or having the check engine light coming on. I would think that removing the center ones it would effect the sensor readings. A complete new custom exhaust can cost upwards to a grand.

 

Another vote for the Mina system; a bit louder and refined. Some of the suggested modifications result in too much sound or low droning at certain rpm's. Unless you drive alone, or never want to have a conversation with your passenger, I's stay with a Mina system or something comparable.

 

adamesh, cheap, stainless and sounds great plus you can use the part systems to replace either the middle or rear silencer ,or go the whole hog and replace both

 

Nothing will trigger a CEL or cause issues with the O2 sensors unless you mess with the CATs.