I have a 99 gmc sierra v8 i was wondering what i could do to make it louder i already have a cutout before the muffler/after the cat and it still isnt loud enough. i know i can install cutouts before the cats but if i do that it will screw up the oxygen sensing system and all of that garbage. is there a way to make my truck "race car" loud without it being a pain in the rear. Also do they make an h-pipe or an x-pipe or something for sierras so u can have true duals or do u just plain have to custom fabricate something or modify the factory y-pipe?


Is it just me, or does it seem like the newer the vehicle the harder it is to modify because of all sensors and intergrated garbage?

 

Want loud put long tube headers on it .you have to trick the ecm thinking the sensors
are still working.
Just go down to your local muffler shop and he will be more than glad to put true duel exhaust
on your truck$$$$$$$$$$$$$$$