My buddy had one on his mustang v8 and it would make a whistle noise around mid range RPM, and felt alittle bit of power but not sure if it would make a noticable difference on our 3.5 liters? any input is appreciated

 

Lol, you need to SEARCH.

I run a 5/16 and i get power, lots of people run spaces on the forum. id advise you search G35driver for motordyne spacer reviews.

 

doesn't sound like OP's talking about the plenum spacer... he did say tb spacer..

 

I think the TB spacer is a waste of money. Don't bother.

 

^ +100000000000000000

I don't see that mod doing anything at all.

 

The B15 guys swear by TB spacers, when someone asks what's an affordable easy power mod they all say TB spacer.

I have no experience with them on the G/Z though.

 

Supposedly they increase the volume in the plenum and increase the velocity in which air flows in... only way to tell is someone should do a baseline with a stock g35 and measure it with just the TBS

 

Age old debate that seems to have sharply divided opinions. Some people swear by them some people swear at them. I haven't seen any conclusive proof they show any power gains ie. dyno results posted here. Maybe do a search on my350? They seem to have a lot more members that are into the technical side of our motors then we have here.

 

I will look on the 350 site

 

i'd throw it on if someone gave it to me for free