Firstly what can I say, the plenum is a quality piece of kit and  the gloss finish looks amazing. It has been a long time coming as it has been designed, re-designed and tested many times over to get the best fit and performance ever. Below some of the results of tests are laid out.

I buy these direct from the manufacturer's.

If I didn't believe in this product I wouldn't be selling it.

It comes with full fitting instructions and a bottom vacuum pipe securing clip and throttle body securing bolts.

Features.

• Increase in BHP & Torque, expect to see gains from 5 - 10 bhp peak & 20 to 40 lbft torque. In tests it saw up to 25bhp mid range gains. 
• Heat treated for 36 hours & then pressure tested to 56 psi to ensure maximum strength
• Won't crack or burst like ford plastic manifold
• Unique & Stunning design, by far the best looking manifold available
• CNC Inlet ports to match lower section of the Intake manifold 'Injector side' only 1 other cast manifold offers this critical design feature
• Value for money.