If you want the best-made, best-performing and best-sounding catback for the Maxima (remember, if the mufflers have single tips, they're for the Altima), check out the Cattman catback.
Most 04-08 Maxima catbacks are improperly designed, with a 2.5" tube down the middle that splits to two 2.5" tubes to the mufflers. This is contrary to the basic rules of exhaust design - if one tube splits into two, the two tubes need to be a smaller diameter than the one tube or else there's a sudden drop in exhaust velocity, turbulance, and loss of performance.
The Cattman design uses a 2.5" tube down the middle and splits to two 2" tubes, and we get better performance (and sound) as a result.
yea i planned on getting the cattman around christmas i asked around on the maxima.org forum nd def want 2 get the cattman, nd keep the quad exhaust nd i also heard amazing thingz about ur work soo gunna pick it up.
oo nd do you have a y-pipe for the 08 max??