I was seconds away from pulling the trigger tonight on the Motordyne 5/16" Iso Thermal Plenum Spacer.... However, I noticed that they are on backorder until mid January!

I can't wait that long. I know, it's not that long, considering the HKS exhaust waiting list, but I gota have my plenum spacer NOW! Does anyone know where else you can order them other than directly from Motordyne?

Lastly, I understand that the 1/2" spacer will not accomidate the engine cover, so, with that said, is the extra $50.00 bucks worth the little extra horsepower over the 5/16" spacer?

I have an 04 6MT! Looking for my best option for horsepower. I want the best gain, so even a full Crawford plenum isn't a bad second option. Actually, according to the Dyno's on Motordyne's website, the spacers put up better HP gains! I wouldn't have guessed that! So, if there are no alternate sites that sell the spacer, should I just get the full Crawford Plenum?

Considering the slight price difference, should I just get the full Plenum?

 

I purchased my 1/2" Spacer from Partshippersdave, he may have some in stock.

As far as clearance goes, I am able to keep the engine cover on since I have a sedan (you just have to remove the grommets on the inside of the cover). I dynoed my car the other day - 226/216 max, unfortunately no baseline but I have stock rims / 5AT. Whenever I get my scanner cord I will upload the dyno graph :-)

 

Good choice tho.
5/16" adds more power through the all range.
1/2" adds a couple of HP only peak.

Ask TONY(motordyneengineering.com) if he had part.
he had extra one when I order, so I got the part in 4days.