I had originally installed a catback system that I got on eBay and installed an aftermarket G35 sedan replacement muffler on it to quiet it down. I didn't like how it sounded, too raspy and it was all 2.25" pipe even though the listing said 2.5". on top of that it started rattling badly in the rear. I went with 2.5" AP Xlerator XS0426 for the resonator and AP Xlerator Big Max Turbo muffler 690503 2.5". the 2.5" exhaust starts at the Warpspeed Y pipe so no more gutted cat.

along with that is the 4th gen VQ30DE exhaust manifolds and Warpspeed Y pipe. I also used 2 90 degree mandrel bends before the axle. I think I have enough space for another resonator, I might add one just to see how the sound changes. the tip is nothing fancy and the guy tucked the muffler a bit forward and put an extension pipe on it. I also have a new tip on the way.

going to 2.5" from 2.25" really made a noticeable difference in top end and low end power. the low end power has helped a lot for stop and go around town.

also pretty quiet from inside, not much drone. modified stock air box makes more noise than the exhaust now.





new tip that is on the way

 

did a quick pull after getting the exhaust installed.

even with 245/40 18 tires and H-LSD the tires still cut loose in 1st around 5,000 rpm, didn't do that until I got the ECU flashed.

 

Sounds good. 305k mi! Wow! Nice work keeping it up.

 

she started sputtering last night, I'm guessing a coil is going bad or oil is getting to a plug. waiting for the engine light to come on.

 

Got any codes? I thought I borked mine yesterday. Washed the engine for the first time with degreaser and a garden hose. Fired right up and ran for about 5 min then died. Crank but no start after that. Threw cam codes. Runs fine now that it's all dry. That's why I hate washing engines! Plus the degreasers I used seriously tarnished my brand new shiny strut brace. Not sure what happened there. By the way, the Megan strut brace clears just fine. I think I need to post that on the other thread I started.

 

no codes yet. I don't see any oil in 1,2,4,5 or 6. I didn't feel like pulling off the intake manifold to get to #3 I even jumped the gun and ordered a set of those mitzone aluminum valve covers, only $92.44 with shipping.

months ago I had a misfire so I got new iridium plugs and 6 coils that came in Nissan box's. that time around I had oil in plug #2, so I just changed all the plugs and just the rear coils along with cleaning plug tube #2.

I'm guessing this time around a front coil is bad since they are older. I'm about to change the front 3 with the other 3 Nissan coils I didn't install when I did the back 3. although I would rather find the bad coil and keep good ones as spares. but I'll just buy a set of 3 and have them for when I need them.

I wonder if people selling non OEM coils would go this far and make fake Nissan box's?

 

Anything is possible with the boxes. It's happened before. Know your source. Caveat emptor.