[dieselenthusiast]

I have the 4040XL and let me tell you, it was loud with the cat off. I drove it for a week and put the cat back on.

 

[dieselenthusiast]

how loud comparing to a straight pipe?

IMO, I would remove the cat and keep the 4040 and see what you think. I can guarantee it is much louder than you might think. The 4040 makes it sound nicer than just having a straight pipe IMO.

 

[dieselenthusiast]

Thanks, Im going to try to get it installed before the end of the week

Keep us posted. I want to know what you think. The 4040 does sound very nice, and if you want loud, then take the cat off and you will hear loud. :thumbsup: