ja50n,
Get somebody who has a stock extention pipe who wants a waste pipe... and swap lor. =Þ
Usually to do that is around 300 bucks... so if u swap, u ownself nego a deal with the buyer lor. Ask him pay for swapping fees, then top up cash if necessary lor.
pathfinder,
if let out to atmosphere... its like having a bigger exhaust... so should be betta la for turbo. =Þ