whats difference between the oem tank and the aftermarket tanks besides giving the engine bay a nicer look does it really help the engine or something even if my engine is not FI? btw I'm AT.

 

They just look better and will never crack like the OEM plastic.
Here is a set of my new custom tanks:

 

...and if you like square:

 

 

Stuff like that is just mostly for engine bay cosmetics. It won't make any functional difference on your car in terms of performance and I've never heard of the OEM ones failing unless the car is in an accident in which case the coolant overflow reservoir can and usually does crack if it's a front end impact.

 

i see, yeah your right

 

When I first started modding my engine all we had available were aluminum caps then we graduated to ARC tanks like Marcus has. Sean made available the ones he posted which work just a well for a lot less $$ so it's all about what you like and can afford or I have my aluminum caps laying around if you wanta buy them for the cost of an In N Out burger....Gary

 

Just to clarify, there are only 2 people with an ARC coolant tank (modified overflow/catch can combo for the VQ35HR) on a VQ35DE; mine was originally sourced and modified by Marty_G. I'm rocking that one and Sean's PS tank.

 

Wow! That's an awesome looking engine bay!!

 

iIhad my coolant and power steering tanks red anodized as I don't like to polish stuff. Will the new round designs work/fit on a 350Z?

 

^ they mount the same way as the square ones.

 

pmed

 

Sorry ace... I sent gary the first pm about the caps...

 

Are these available on the internet or were both custom made?

 

Sean or Forum name SxExCx sells them both round and square.

PM him he will make you happy...