hey not sure why they wouldn't offer it in an 03. pm Jason Burtman of burtman industries. he might have a better idea than me if you could run the dual exhaust on your 03. i don't see any reason why not at this point though.
well your really not going to get much better gas mileage. i hate to break it to u but the factory exhuast is very efficent. now if u drove a 98 dodge 1500 v8 then yes a whole system would help but in a 4th gen 4runner it really wont sorry
I think im just gonna go with the Flowmaster 40 muffler, cut off the resonator, and re-route the exhaust.
Thats basically what I did except for I used a magnaflow and only spent a couple hundred vs spending 500+ for a catback system and I couldn't be happier
4runner8, sure ya can, but remember, that mufflar u posted was almost 100 bucks,then you have to consider the cost of custom bent pipes, & 2 ss tips if u want em, id say, ur still looking at around 300 to do it. the cost of labor today is sky high.