Upgrade Stock Manifold

Is there a company in the UK that can make a stock manifold more efficient and higher flowing?

Exhaust, intake, 2JZ-GTE, 2JZ-GE, J-spec, UK spec?

whatever would be required for wanting to run more power if i hybrid my turbos. I am going to the US next week and some guy is taking me to a tuning house (not sure of name) who deal with Hybrids which run up to 600 BHP so wanted to sort my manifold out for maximum flow and reliability?

Any recommendations other then going single as dont fancy that.

Are they re-manufactured stock housing hybrids or garret ones?

The re-manufactured ones require the stock manifolds to be reused, but i believe it's the same with the garret ones. The 'real' hybrid ones will be lucky to get 420bhp on a BPU car, 450 will be the maximum afte ECU change etc (essentially everything but the single conversion). US figures and all that...

Unless they're talking about big twins....

Any links to these turbos? As Homer says 450hp is around the max you can get out of hybrids and that's with a lot of associated mods; cams, fueling, ECU, etc.

If a US company is claiming that hybrids can achieve 600hp don't believe a word of it, the only way to get that sort of power is to ditch the stock manifold/turbos and fit either a single or twin turbo kit.

The SpeedForSale kit (http://www.speedforsale.com/supraparts/speed-sale-gt28-style-hybrid-stock-twin-turbo-upgrade-p-635.html) is claiming around 550whp (with race gas).

They are apparently GT28's horned into the stock-ish casing. Not sure about them, though.