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Nissan 350Z: Exhaust and Air Intake Mods Andrew Totolos makes a few enhancements that help a new-generation Z-car breathe easier — and go faster. From "Tricked Out" episode DTRK-407

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Mod #3: Install High-flow Dual Exhaust System

Now that Andrew's got as much air flowing into the engine as he possibly can, he decides to switch gears and work on upgrading the exhaust. He installs a stainless steel dual exhaust system in order to remove as much exhaust from the car as fast as possible to maintain top speed.

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Andrew compares the stock exhaust with the new dual version.

Materials/Tools:

high-flow dual exhaust
penetrating fluid
exhaust hanger removal tool
jack stands
rubbing alcohol and rags

	Dual exhaust components
	The H-pipe

High Flow Exhaust: Breathe In Cold, Breathe Out Hot

The exhaust system we selected for this Z is a true dual-exhaust set up with two pipes that run all of the way from the catalytic converters to the tips.

The pipes are about the same size as those on the original stock exhaust system, but with two pipes instead of one, you’re doubling your flow. This is important since, when the engine is revving at high rpm’s, you’ve got to get that exhaust out of the car as fast as possible to maintain the top speed.

Our secret weapon in this exhaust system is the H-pipe. It creates a siphon effect to get the exhaust moving at low rpm’s to get it out of the system as quick as possible for better torque and a faster jump off the line.

	Figure A
	Figure B
	Figure C

Removing the Old Exhaust Components

• Before doing any exhaust work, give the car plenty of time to cool down. Otherwise, you'll risk getting burned.

• Once the car has cooled, the factory exhaust system must be removed.

• Before doing any wrenching, spray down all of the exhaust system bolts with penetrating fluid (figure A) to make breaking them loose easier.

• Loosen all of the fasteners before actually removing any parts (figure B).

• When everything is loosened, separate the mid-pipe from the collector and pull the big Y-pipe out of the car.

• Use an exhaust-hanger removal tool to pop the hangar off of the mid-pipe (figure C) and pull it out before starting to drop the hangars on the rear section that includes the muffler. Support the weight with a jack stand while removing the remainder of the hangars.

• Carefully lower the muffler out of the car.

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