The OEM exhaust running from both engine banks connects the pipes on one after the cats by an "Y" configurarion,then goes along all the way on the driver's side to the rear end.
All you got to do is get rid of that Y connection & run another pipe on the passenger side,same as the left side,the smaller the size of the muffler the better,honestly there is not much room to play with on the passenger side;My 2nd muffler lies right under the charcoal canister,but i could work without any problem.
The gains are less backpressure,more exhaust flow & faster sprint off.
I spoke with a dynomax costumer rep & he told me dynomax is one of the few muffler manufacturers that proves vehicule gains performance specs by using their products :
"We at dynomax are well aware that most of the cars enthusiasts love the high growl of hi-tech mufflers under the cars,but that doesn't assure it will provide better performance for they vehicules after intallation,And what about those that prefers a low,less noisy & discrete growl,but with excelent performance from their mufflers ? Those also deserves a good-quality muffler"
The dynomax superturbo (model 177-47) is 4 1/4 x 9 3/4 " in diameter,while the overall body lenght is only 25 1/2 ".
Both,inlet & outlet are 2 1/2" which is the OEM diameter of the VX exhaust pipe so no adapters are needed.
But dynomax has other muffler configurations for those whom choose not to run two mufflers,but two inlet to two exhaust pipes,one inlet-two exhaust,etc
If you want your neighbors to know whenever you are coming or leaving then go for magnaflow,flowmaster & borla,but if want to catch your wife cheating on you @ home then go for the dynomax LOL
Here's they website :http://dynomax.com/mufflers.php?muffler=superturbo