Originally Posted by trav09
thanks for website. Great sound, i read on other threads where performance mufflers were messsing with fuel saver and therefore lower mpg. Is this a relevant prob?
Yes it is relevant, but as i said many have found the exhaust mod positive and working fine. I guess it is somewhat due to what set up you go with.
I used to own a silverado with the same deal and went with flow 50 then 40 then finally cherry bomb extreme and all had a ricey sound when in 4cyl mode.However this combined with cai my mileage did increase.
But have heard good things from the mufflex magnaflow
You will notice a difference in sound when in MDS but as far as how bad or good depends on what you run.
When i drive mine now without a mod exhaust i know when my MDS has kicked in.
Start with something that is not to expensive and if you don't like it then you can take it off.