If the top mount kit used tubular manifolds, vs the current cast manifolds ("low mount kits") it would outperform the cast manifolds all day long.

All the cast manifolds for the VQ have been a big restriction when it comes to big numbers, and no, 700whp is not big numbers. I am talking numbers north of that. Not to mention using an external wastegate, and something other than a T25 turbine housing with a tubular manifold.

You will never see a big power VQ with a cast manifold, but you will see one with a tubular, equal lenght manifold.

wow that is just amazing! i know there is a shop in Denver Colorado that i thought about going twin turbo setup on my car but the kit is very expensive and the turbos are very advanced.

But i guess if you have allot of money anything is possible. he he he

Trish

I agree, boosted z. Log manifolds are not the best for flow. You do want to keep heat in the turbine housing, but a simple coating or exhaust wrap can do that for you. A tubular manifold will scavenge exhaust gases much easier from the heads. Log manifolds are easier to produce (most bolt on kits use cast iron), and it's easier for them to retain stock parts like ac/power steering and stock downpipe locations rather than building a top mount manifold. I wouldn't say that top mounts are all form, they do make good top end power and high dyno sheets from what I've come across.
Switching from a log manifold to a tubular mini ramhorn, I saw the same power levels at lower boost pressures on my other car. Just my opinion

You've been saying you're interested in boosting your Z:stirthepot:

I contacted full race about doing a tubular manifold setup for the vq - they said no :(

Is there even enough room for them?

I don't mean to argue that tubular isn't better than cast "log" manifold. I am talking about the bigger picture, which is making the entire kit work in the space we have without giving things up like accessories. For our platform, I just don't believe top mount is a better solution and I think the product offerings out there tend to support that circumstantially. I'm not saying I don't want someone to try, or that it wouldn't look cool, or that it couldn't make great gobs of power, but rather, that it's not the best engineering decision for our cars accounting for all variables.

As far as mass production goes anyway.;) Im thinking hard about doing this myself I plan on buying a TIG in the next two or three years and cant wait to tear something up with it. lol