HKS Hi-Power Catback Exhaust for 00-09 Honda S2000

HKS Hi-Power Cat-Back Exhaust - 2000-2009 Honda S2000

The F20C is one of the great naturally aspirated engines, and it deserves an exhaust that doesn't get in its way. The Hi-Power design does that by minimizing bends and giving gases the straightest path out, which on an engine spinning to 9,000 rpm is exactly where the gains are. Two configurations available: a dual exit built for naturally aspirated cars and a single exit racing system designed for turbo applications.

Dual Exit Or Single Exit?

These are genuinely different systems for different cars, not two styling options.

Dual exit is the naturally aspirated system. Twin 94mm polished tips fed by dual 60-50mm center pipes, built from S409 stainless. This is the one for a stock or bolt-on S2000.

Single exit is a racing muffler built for turbo applications. A single 74.7mm pipe into a 97mm adjustable-length titanium tip, made from S304 stainless.

Why The Single Exit Uses One Big Pipe

Worth understanding, because the difference isn't cosmetic.

A naturally aspirated F20C produces a manageable volume of exhaust gas, and dual smaller pipes suit it. You keep gas velocity up, which drives the scavenging that pulls spent gas out of the cylinder, and you get the balanced dual-exit look the S2000 wears well.

Add a turbo and the math changes completely. Exhaust volume climbs dramatically and the restriction moves. A single 74.7mm pipe gives that volume somewhere to go, which helps spool and top-end power. On a naturally aspirated car that same pipe would cost you velocity and midrange for nothing.

So buy the single exit if you're boosted. Buy the dual exit if you're not.

The Titanium Tip Is Adjustable

A nice detail on the single exit system. The 97mm titanium tip is adjustable for length, so you can dial in exactly how far it sits relative to the bumper rather than accepting whatever the fabrication gave you.

The titanium gradient finish is the other half of it, and it's immediately recognizable on a car built seriously. The dual exit uses polished stainless tips instead, which suits the cleaner street look.

Quieter Than You'd Expect

Here's a number worth knowing. HKS measures the dual exit system at 95dB closed, and a stock S2000 measures 95dB. Same figure.

That doesn't mean it sounds identical, because tone changes considerably and you'll hear the difference immediately. But it does mean the Hi-Power isn't buying its flow by simply being louder, which is what a lot of cheaper systems do. You get better breathing without the car becoming a problem in your neighborhood.

Straight Path, Fewer Bends

The core of the Hi-Power design, taken directly from HKS's endurance and GT racing work in Japan.

Every bend is a restriction. Gas has to change direction, which slows it and creates turbulence, and turbulent flow moves through a pipe considerably worse than smooth flow. HKS lays these out with gentle bends and direct pathways to minimize that.

On an engine that revs to 9,000, the top of the range is where a restrictive exhaust costs you most, and it's where you'll notice this most.

Fitment

2000-2009 Honda S2000, including CR

Dual exit: naturally aspirated application, S409 stainless, twin 94mm polished tips, 60-50mm dual center pipes
Single exit: turbo application, S304 stainless racing muffler, 97mm adjustable titanium tip, 74.7mm center pipe

Who Should Run This Exhaust

This is for the S2000 owner who wants a genuine HKS system rather than a generic cat-back. If the car is naturally aspirated, the dual exit gives you better flow, the Hi-Power tone, and a finish that suits the car. If you've gone turbo, the single exit is built for exactly that. Pick based on what your car actually is, and go use the revs.

Fits: 2000-2009 Honda S2000, including CR. Type: cat-back exhaust system. Dual exit: S409 stainless, 94mm polished tips (left and right), 60-50mm dual center pipes, 95dB closed. Single exit: S304 stainless racing muffler, 97mm adjustable-length titanium tip, 74.7mm center pipe, 95.5dB closed.