it will. There are a couple of benefits from the bigger 4" DP's over the stock systems.
First is the 4" systems are the proper size for optimal exhaust flow without being too big. We have found the 5"+systems do not retain enough heat (they cool off too quickly) and as a result the heat trying to escape cools off and it diminishes the flow actually slowing down the exhaust.
As well, the increased size allows heat to escape out of the exhaust collar faster, which enables your engine to expell heat from the cylinders easier, reducing the egt temps and allowing you to keep your foot in the throttle for a longer pull time. Because the hot side can spin more freely, so then can the cold side, giving you faster spool-up and quicker buildup of torque. Our Intakes actually work best with a 4" exhaust system.
When coupled with an aftermarket exhaust manifold the 4" exhaust systems work exceptionally well. We have several DP's being built right now with an improved design, fitting the 1st gen frames, auto transmission heat exchangers, as well as standard or wastegated exhaust collars. The DP's bolt up directly to existing turbo collars and completely replace the stock downpipe system. The exhaust after that point is then up to the owner based on individual wants/requirements.
If you have any questions please reply with a PM and I'll work with you 'offline'.
- Sam
ASA Modifieds