Powers Pages - 2004 Honda Civic Si EP3
The GReddy Racing Ti-C cat-back exhaust combines 409 stainless steel piping with a blue hued titanium tip. Using a straight-through design and larger diameter piping than the factory exhaust, this cat-back system not only looks a thousand times better than the factory exhaust, it's mandrel bent design helps reduce backpressure while creating horsepower. We liked the fact that the titanium exhaust tip was removable when installing the tri-mounted silencer, which offered a stealthier and cleaner look, rather than having the silencer positioned near the exit of the exhaust tip.
Installation of the exhaust can be a pain in the ass if you attempt to tackle the project on your own. We suggest the aid of a friend or neighbor to help speed up the process. A can of WD-40 goes a long way when finagling the rubber exhaust bushings off the old system and onto the new unit. Be sure to securely tighten the new nuts and bolts supplied with the exhaust. The last thing you want is to end up donating your new exhaust to Caltrans when it flies off onto the freeway.
Exhaust, mid-pipe, silencer, nuts and bolts, gasket, license plate frame, stickers
12- 14- and 17mm socket, 12-, 14- and 17mm open end, ratchet, extension, crescent wrench and WD-40
60 minutes
After installing the new exhaust, we broke it in with some spirited runs before we finally strapped the Civic on the dyno. The newly installed exhaust responded well as our initial stab at the throttle 'till redline showed an increase over our dyno run using the K&N intake. From 3500 rpm, the dyno revealed a 2hp gain while torque came in at a 3 lb-ft improvement. The largest gains in peak power were relevant at 4700 rpm with a pickup of 5 hp and 4 lb-ft of torque while power levels continued 'till redline.
Greddy Racing Ti-C Cat-Back Exhaust
Peak HP 149.6 / Peak TQ 131.3
Horsepower Gain
1500 to 3500 HP range: 1 to 2
3500 to 5500 HP range: 2 to 4
5500 to redline HP range: 4 to 5
Torque Gain
1500 to 3500 TQ range: 1 to 3
3500 to 5500 TQ range: 3 to 5
5500 to redline TQ range: 4 to 3
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