ACT 1999 Acura Integra XT/Perf Street Sprung Clutch Kit
ACT AI4-XTSS is the clutch for a B-series Acura Integra that now makes more power than the factory clutch was built to hold but still gets driven on the street. If your 1999 Integra GS-R, LS or Type R slips in fourth under a full-throttle pull, smells hot after a spirited drive, or flares between shifts since you added an intake, header, cams or a mild turbo, this kit pairs ACT's heaviest street pressure plate with a full-face organic disc that still engages smoothly.
The clutch sits between the B18 engine's flywheel and the five-speed gearbox. The pressure plate clamps the disc against the flywheel, and that clamp load decides how much torque passes before the disc slips. AI4-XTSS uses the H025X Xtreme pressure plate, which ACT builds with a stiffer diaphragm to raise clamp load and cut deflection. The disc is ACT's 3000105 Performance Street sprung disc: a 220 mm (8.7 in) organic facing with high copper content for heat transfer, a steel-backed lining for burst strength, and reduced marcel for quicker shifts. ACT rates the kit at 320 ft-lb at the crank, 72 percent over the factory clutch.
The point of this combination is drivability. ACT describes the feel as moderate to heavy pedal effort, smooth engagement and OE to mild gear rattle, which is far easier to live with in traffic than a puck disc. If your build is past 320 ft-lb or sees drag launches, the AI4-XTG6 six-pad race version uses the same plate with ceramic pads. If the car is near stock and you want a lighter pedal, look at the AI4-HDSS heavy duty street kit.
Rule out the release system first. Whether your car uses a cable or a hydraulic release, the bearing has to back fully off the diaphragm fingers when the pedal is up, or even a new clutch will slip. Check pedal free play, then do a road test: in fourth at about 2,500 rpm, go to full throttle and watch the tach. A needle that jumps ahead of road speed means the disc is slipping. Inspect the bellhousing drain for oil, because a leaking crank seal will ruin new organic facings. Our slipping diagnosis guide and flare versus slip explainer walk through telling a clutch problem from something else.
Our listing is titled for the 1999 Integra, but ACT's application chart for AI4-XTSS covers more: 1994-2001 Acura Integra 1.8L (B18B1, B18C1, B18C5) with the five-speed, including GS, GS-R, LS, RS and Type R; 1994-1997 Honda Civic del Sol VTEC; 1999-2000 Civic Si; and 1998-2001 CR-V EX and LX 2.0L. It does not fit D-series or K-series cars. Engine swaps are common on these platforms, so match the gearbox actually in the car, and send us the year and VIN or the engine and transmission codes if you are unsure. Every Integra clutch option we carry is in the clutch and rebuild kit collection.
A flywheel is not included. ACT sells its 600105 Prolite and 600110 Streetlite XACT flywheels separately.
| Brand | ACT |
| Part number | AI4-XTSS |
| Fits | ACT 1999 Acura Integra XT/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Acura Integra Xt/Perf (1999) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. ACT lists AI4-XTSS for 1994-2001 Integra 1.8L five-speed cars, including the GS-R with the B18C1. Our listing title only names 1999, but the part is the same across those years. If the engine or gearbox has been swapped, send us the codes before ordering.
ACT says to expect roughly 50 to 80 percent more pedal effort with an Xtreme pressure plate, depending on the car. ACT itself describes the feel as moderate to heavy. If you want a lighter pedal on a mildly modified car, the AI4-HDSS heavy duty kit is the step down.
Both use the same H025X Xtreme pressure plate. XTSS has a full-face organic street disc rated at 320 ft-lb with smooth engagement. XTG6 has a six-pad ceramic race disc rated at 410 ft-lb that engages much more abruptly. Pick XTSS for a street car, XTG6 for heavy boost or drag use.
No. The kit includes the pressure plate, disc, release bearing, pilot bearing and alignment tool. Resurface your flywheel or buy a new one, such as a steel Integra flywheel or one of ACT's XACT flywheels.
Check the release fork, pivot ball and rear main seal while the gearbox is out, and change the transmission fluid. A seeping seal will contaminate the new organic disc, so fix any oil leak before installing the clutch.
Yes. Drive normally and avoid hard launches and high-rpm shifts for the first few hundred miles so the disc and flywheel surfaces bed in evenly. Skipping break-in is a common cause of early chatter.
