Well, ive been doing some reading on cattman headers and the y pipe they sell... They sell a y pipe that fits the stock headers for i think about 350.00 Then they sell headers and a y pipe that fits these headers together they sell for about 750.00 plus 20.00 for tools. What is the better deal? I read that "your exhaust is as big as ur smallest pipe." So is it worth buying the headers and y pipe together? And i can see that most of the gain is from the y pipe.. I need peoples opinion on this!

Instead of that get a budget y-pipe for $180 (gives you aprox 20whp), MEVI, and maybe get a ECU upgrade to maximize the increase from MEVI

That be more money he's using though. About 3-4 more hundred. . .And I think the header assembly has the y-pipe already in the piping. . .comes as a package. Y-pipe about alone 12-15 FWHP

Headers will eliminate the use of a y-pipe. As NmexMAX said, it is all one piece.

Leave the headers alot just get the y-pipe. Too much damn work and money on those things. For maxima it's useless.