30-04-2012, 07:23 AM
FYI how the car's used/driven won't make the blindest bit of difference to how flow's affected by the change in bore. The sudden expansion in diameter will cause a sudden reduction in gas velocity, which is a significant restriction in itself. Same theory as tuned-length manifolds; pressure-waves will be travelling up and down the length of pipe, which will interfere with gas flow through the turbine (am i right in thinking the rest of your exhaust piping is straight-through..?) and harm spool times.
Don't know enough about it to be able to tell you whether it'll be better or worse than the standard box, but as Mark says you'd be much better off with a bit of pipe in there. Tbf would be very surprised if it was worse than standard, but you seem to enjoy accumulating knowledge so thought you might be interested anyway.
Don't know enough about it to be able to tell you whether it'll be better or worse than the standard box, but as Mark says you'd be much better off with a bit of pipe in there. Tbf would be very surprised if it was worse than standard, but you seem to enjoy accumulating knowledge so thought you might be interested anyway.