hello im after a stainless steel 4 branch manifold for my new engine
2.0 16v ecotec, fitted with weber 4x45 throttle boddies, lightened and balanced flywheel, courteney high torque cams ,silenced de-cat pipes stainless steel cat back scorpion 2.5" and a long final f18 gearbox.
what would be better for this set up 4-2-1 or 4-1?
do sbd do one?cost?
lexmaul manifold like?
4-2-1 gives a better spread of torque and is more suited to road use,the standard tubular manifold on an XE is of the 4-2-1 design.
4-1 gives more outright high rpm BHP,which is more suited to race engines.
SBD might do one,they do for the XE,and janspeed also do them for most of the vauxhall range although not sure if they are stainless or mild steel.
The SBD ones are expensive though,im sure the SBD stainless ones are nearly £300.
What about getting a second hand XE manifold,cut the XE flange off and weld an eco flange on,you might have to bend the pipes slightly to line up but it would save an awfull lot of money,demon tweeks sell flanges,see the motorsport catalogue.