Rep Power: 773

you're not doing anything from that forward. so its still restricting.

 
Rep Power: 1069

so doing any cat back is restrictive (even though the 4th gen cats flow extremely well)

 
Rep Power: 747

that doesn't make any sense, yes the stock manifolds and y-pipe are restrictive and to get the best possible numbers should be replaced but to say that a catback or a muffler is restrictive because you are running it w/ the rest of your oem equipment is crazy. it would be more correct to say your exhaust system is still restricting, not the catback or muffler is restrictive

 
Rep Power: 1069

there will always be something limiting power somewhere

 
Rep Power: 719

1: when i got my ram air hood i noticed a nice difference in throttle response and a few more horses..do intake, exhaust, suspension, and juice...lots and lots of juice

2: just take care of the weather stripping