I have the Skunk2 5/8" plenum spacer that I got cheap ( I know a lot of people prefer the MD but I got it cheap enough to not care..lol ).

Install was a piece of cake ( took under 45 minutes and it was the first time ever doing this on a G35 ) and the car is running perfectly...the only problem is that I feel it weak down low.

For example, I may be cruising at 25mph and I go WOT. Before the car would downshift pretty harsh and immediately pull. Now the car downshifts kinda soft and slowly begins to pull. It feels kinda laggy but it's not the tranny cause the downshift is immediate. The car pulls just as hard ( or harder ) up on top though.

If my car had a leak, would it not run like crap? Idle is perfect and it runs perfect.

Car is hella loud too...the intake sounds like it's gonna explode...it sounds GREAT! LOL.

 

When did you do the install. Have you given the ECU to relearn with the mod? It does need to adjust.

 

You may be right...I did it yesterday night and tonight I do feel it better. Maybe tomorrow it'll be back to it's only torky self.

 

Yea, if it doesn't feel like you gained, you can always reset the ECU. Disconnect neg. battery terminal blah blah blah.

 

After researching Motordyne's website dyno results, you'll know why you might have lost some torque.

Hint. The 5/8" spacer is 2x as thick as the 5/16" spacer.

 

oh damn, That's even bigger than the 1/2" motordyne. Good catch Jeff92se, Skimming FTL. But yeah, that may be it.