Thanks to everyone....

[Hypnoticj30]

who welcomed me.this is a good website ive learned alot already. i jus have one more question about performance for my j30...i recently bought a k and n for it and i want to know if i should get cat back exhaust?

[driverdriver]

Is there an emissions test in California?

If you have custom exhaust work done make sure that you'll be able to pass any emission tests.

[Hypnoticj30]

ya..there is and its strict i dunno when i bought this car i was really excited like o cool a nissan 300zx engine there should be alot of mods so i bought little things some k and n filters and thought about intake pipes and exhaust but forget that now...im just going to tint it and maybe new rims and a good stereo

[kbflip02]

if you want it to still pass emisions i replace the stock cats with High Flow Cats(they still pass) and then replace the stock resonators with magnaflows and if its too loud for you add another muffler on the back where the stock one is...

[Hypnoticj30]

where can i get all that at?? im a noob when it comes to ordering parts

[kbflip02]

find a reputable muffler shop in your area...they should be able to get everything you need...the way your car is setup now is that it has 2 cats, then 2 resonators, ending in one muffler with dual tips...replace the stock cats with High flow cats(make sure the people you get them from will GUARANTEE theyll pass emissions), replace the resonators with magnaflows or any other free flowing mufflers, then finally have each individual pipe come out the back and weld on the tips...final result should look something like this although the guy who did mine was kinda drunk(i made the mistake of offering him a beer in the middle of the job) but you get the idea...personally i took this time to have them increase the pipe size to 2 1/4'' from 1 7/8'' to begin with...if its too loud for your liking you can get some better resonators that will fit and put them after the magnaflors but before the tips somewhere in the equation...

the end result will look something like thisand the cats will look something like this but will come before the picture above

hope this helps



as long as your happy who cares about anyone else right?

[Hypnoticj30]

how much does all that cost?

[kbflip02]

i spent $700 on mine parts and installation but if i wouldve looked around and priced various places i know i could have probably gotten it cheaper...go check all the local muffler shops