I'm familliar with all the info on the Motordyne spacer, but....

Did anyone consider the AAM angled spacer?
There's a thread on MY350Z
AAM SPACER
and
Dyno info from old group buy

What I thought was interesting is that it is angled...
suposed to get more air to the front 2 cly which run lean.
Interesting theory, but don't know if it's any better

I think there were some initial mounting issues with the washers due to the angle, not sure if they got sorted out.

EDIT: Opps this should'nt have been posted in reviews; mods please move

 

It's a play on Crawford's positioning... my guess is that it provides the same gains as the MD Spacer and plenums.

 

Following the whole spacer/angled spacer/plenum thing, I would opine that the AAM has the least complete hardware package, worst install instructions, and most end-user issues.
From what I've heard/read Crawford's customer service is excellent, and the few issues they have had have been resolved.

Motordyne has had few if any hiccups with their products, and I can attest firsthand to their excellent customer service, clear instructions and complete hardware package.

 

I would say is to get Motordyne Spacer. It's well worth of the mod and money. Get the groupbuy price at $160 for 3/8" plus shipping. Get it soon b4 summer starts!! I'm starting love the higher rpm!

 

I would definately say get other kind. Crawford is good one to choose. I has AAM and took it out. I have just sit in my garage.