DC Sports Header for 02-06 RSX/02-05 Civic Si

DC Sports 4-1 Header - 02-06 RSX / 02-05 Civic Si EP3 K-Series

You've got a 2002-2006 RSX or a 2002-2005 Civic Si EP3 and you're tired of that factory manifold choking the K-series. The stock exhaust manifold's restrictive by design. It's holding back the engine. You know there's power sitting there that you're not getting. DC Sports makes a 4-1 ceramic coated shorty header that fixes that. True equal length runners. Large diameter primaries. A smooth 2.5" collector. Mandrel bent so exhaust flows clean. It's a shorty design so it bolts right to your factory catalytic converter. You're getting better scavenging. You're getting lower backpressure. You're getting stronger mid-range torque and real top-end power. The VTEC crossover's cleaner. The throttle response gets sharper. And the ceramic coating reduces under hood temperatures so everything stays cooler during hard driving. Available in polished stainless or ceramic coated. The ceramic's worth it if you're pushing the car hard.

Here's What The Factory Manifold's Choking Your Engine

The stock manifold on the K-series is a restrictive mess. It's not built for power. It's built to pass emissions and that's it. The runners aren't equal length. The diameter's too small. Exhaust from different cylinders gets to the collector at different times. That creates backpressure. The engine's fighting just to push the exhaust out. You're losing horsepower that could be going to the wheels. A proper header with equal length runners gets all the exhaust to the collector at the same time. Scavenging improves. The head breathes cleaner. The engine makes real power without working as hard. You feel the difference when you hit the gas.

Ceramic Coated Or Polished Stainless - Pick What You Want

You've got two finishes. The polished stainless looks clean in the engine bay and it fights corrosion. The ceramic coated header does all that and it adds thermal protection. Ceramic coating's rated to 1200°F and it's applied thick. The coating reduces radiant heat so the heat stays in the exhaust instead of cooking your engine bay. You're sitting in summer traffic or you're on the road pushing the car hard and the engine bay gets hot. Ceramic coating helps keep temperatures down. The intake temps stay lower. The hoses and plastic bits around the engine don't get beat up from radiant heat. The whole bay runs cooler. We've seen people run ceramic on their performance cars because it makes a real difference. Street driving. Polished stainless is fine. Track days or hard driving. Ceramic's worth the extra cost.

Shorty Header Design - Works With Your Factory Cat

This is a shorty header which means it bolts directly to your factory catalytic converter. You're not replacing your cat. You're not cutting anything. You're not doing custom fab work. The shorty design keeps everything compact and works with your OEM setup. This is huge because you keep CARB compliance while getting real performance gains. A lot of headers force you to choose between power and emissions. This one gives you both. Bolt it on, keep your factory cat, stay street legal, and get a real power bump. That's the sweet spot.

Built To Take A Beating - Not Some Cheap Knockoff

This header's T-409 stainless steel with thick CNC machined flanges and precision mandrel bent runners. Mandrel bending means the pipe maintains its shape inside so exhaust flows smooth. No sharp bends. No turbulence. Every joint is TIG welded inside and out. The construction's solid so it's not going to warp or leak after a year of high-RPM abuse. You're bolting this on and it's staying on. You're not chasing exhaust leaks and ticks six months later. We've seen people buy cheap knockoff headers trying to save money and they start leaking at the welds. The flanges warp. The whole thing becomes a hassle. Don't do that. The DC Sports header is built right.

Real Horsepower And Torque - Not Just Peak Numbers

You're getting real power throughout the RPM range. Not just a dyno peak that sounds good on paper. You're getting stronger mid-range where you actually drive. Better pull past 6000 rpm when VTEC kicks in. A stock K-series with this header. You're looking at 10-14 hp depending on the engine. Car's already got an intake and tune. You're still gaining real power. Either way you're getting a sharper throttle response. The engine pulls harder all the way up the rev range. You feel it when you hit the gas. The K-series exhaust note gets deeper and crisper under load too. No tinny rasp. No highway drone. Just that classic K-series bark with more clarity. We've seen people put this header on expecting crazy numbers and get disappointed because they thought it was going to add 30 hp by itself. It doesn't work that way. A header is solid. Pair it with an intake and a tune and now you're really moving.

CARB Legal - Run It Anywhere

This header's CARB compliant. You can run it in all 50 states. You're not going to fail smog. You're not going to have anybody hassle you about emissions. Because it's a shorty design that works with your factory catalytic converter you're keeping your emissions setup intact. No swapping parts at inspection time. No worrying about getting caught. You're buying a performance header that's actually legal. Everything bolts together right. The secondary O2 bung matches your factory location. You're doing a real upgrade that stays street legal without sacrificing anything. We've seen people buy illegal headers and then they can't pass testing. Don't do that. Buy the legal part.

What You Get

• DC Sports 4-1 shorty header for K-series
• Fits 2002-2006 Acura RSX and 2002-2005 Honda Civic Si EP3
• Equal length mandrel bent runners
• T-409 stainless steel construction
• 2.5" CNC machined collector
• Thick CNC machined flanges
• Shorty design - compatible with factory catalytic converter
• Available in polished stainless or ceramic coated
• Ceramic coating rated 1200°F (if ceramic option)
• CARB compliant - legal all 50 states
• TIG welded construction
• Dyno proven horsepower and torque gains

Note: DC Sports 4-1 shorty header for K-series engines (2002-2006 Acura RSX and 2002-2005 Honda Civic Si EP3). Equal length mandrel bent runners with 2.5" CNC machined collector. T-409 stainless steel with TIG welded construction. Shorty design bolts directly to factory catalytic converter (retains OEM cat). Available in polished stainless finish or ceramic coated finish (ceramic coating rated 1200°F, reduces radiant under hood heat). Direct bolt-on to stock catalytic converter and OEM components. Factory-location secondary O2 sensor bung. High-temp graphite gasket and rust-resistant hardware included. CARB compliant - legal all 50 states (emissions compliance retained with factory cat). Dyno proven 10-14+ hp and mid-range torque gains (varies with engine modifications). Sharper throttle response. Cleaner VTEC crossover. Better exhaust scavenging reduces backpressure. Works with stock or aftermarket cat-back exhaust systems. One header per order.