Spoon Sports Rigid Collar - Nissan Fairlady Z Z33 - Rear Shampoo from the Glaco series as

from the Glaco series as well as others

it removes any kind of gas flow restriction

This is what has happened with the parts numbers for the right hand and left hand inlet and exhaust camshafts for the Subaru Impreza Version 5/6 STI / P1

so there is no welding or cutting

Spoon Sports Rigid Collar - Nissan Fairlady Z Z33 - Rear Shampoo from the Glaco series asDeveloped by Spoon Sports, the Japanese Honda tuning specialists, Rigid Collars are precision machined aluminium rings that lock your subframe to the chassis. Factories drill the subframe bolt holes oversized so components drop in fast on the production line, and that clearance stays for the life of the car. It leaves the subframe sitting a fraction off centre, dulling steering response and letting vibration through the floor. Fit a set and the bolts