Twin System Better
Today got a new exhaust system fitted, got the extractors aluminium coated and went from a 3.5inch single to twin 3.0 inch and Lukey Race series mufflers and x pipe. The pipes end at diff to keep it 3 inch all the way. A bit boomy at idle but a very deep note driving along...
Bonus all round, under 3000 haven't lost any driveability and I think this is due to the affect of the x pipe. Top end I have gained a heap of grunt - no dyno comparison - but going by the additional spin I'm getting through the gears, perhaps as much as 20-30HP gain.