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 It's easy to see how the factory...  It's easy to see how the factory Y-pipe was compromised with restrictive cats and a 2 1/2-inch pipe. The flat (for ground clearance), left-side section of the Y-pipe shrinks to less than 2 inches, causing another reduction in exhaust flow.  There's a drastic size difference...  There's a drastic size difference between the header and exhaust manifold. The manifold outlet is less than 2 1/2 inches, while the headers 1 3/4-inch tubes merge into a 3-inch collector outlet.  Hank Deniecki is fishing the...  Hank Deniecki is fishing the passenger-side wiring harness through the heat-shield tubing, which is made from heat-resistant fiberglass surrounded by high-temp silicone that is resistant to 1,400 degrees. We added 14 inches of wire to the harnesses' crankshaft sensor, oil-level sensor, and starter-solenoid wires by cutting, splicing, and soldering. However, Hank says that's usually not necessary since there is normally enough slack in the wiring harness. | STRIP-TEST RESULTS | | Run/Temp, Mods, and Notes | 60-FT | 1/8 Mile/MPH | 1/4 Mile/MPH | | March 23, 2006 | | 1./48: Baseline, bone-stock LS1 | 1.96 | 8.57/82.86 | 13.33/103.36 | | 2./50: SLP cold-air induction | 1.93 | 8.45/84.36 | 13.11/105.21 | | Temperature, 50 degrees; Humidity, 35%; Barometer, 30.15 hg; Race weight, 3,680 lbs | | May 9, 2006 | | 1./62: Baseline w/cold-air induction | 1.97 | 8.54/84.07 | 13.24/104.71 | | 2./64: SLP Loudmouth II exhaust | 1.98 | 8.49/84.90 | 13.14/105.99 | | 3./65: Performance Dist LiveWires | 1.97 | 8.45/85.10 | 13.10/106.21 | | Temperature, 65 degrees; Humidity, 61%; Barometer, 29.93 hg; Race weight, 3,680 lbs | | August 8, 2006 | | 1./85: SLP 375HP Pac, spun tires | 2.20 | 8.60/85.50 | 13.30/106.07 | | 2./85: Hotlap, more tire spin | 2.23 | 8.66/85.41 | 13.37/105.91 | | 3./86: 1-hour cool down, spun tires | 2.22 | 8.61/85.60 | 13.31/106.10 | | 4./87: Four runs, couldn't hook up, 2.20s | | 8.60s | 13.30s | | Temperature, 87 degrees: Humidity 54%; Barometer, 29.97 hg; Race weight, 3,680 lbs | | October 2, 2006 | | Temperature, 82 degrees; Humidity 60%; Barometer, 30.04 hg; | | Race weight, 3,690 lbs | | 1./79: LS6 intake, 400HP Pac | 1.96 | 8.25/87.26 | 12.83/107.77 | | 2./79: Hotlap | 1.97 | 8.35/86.27 | 12.95/106.83 | | 3./81: 1-hour cooldown | 1.97 | 8.35/85.95 | 12.92/106.51 | | 4./81: Hotlap | 1.98 | 8.40/85.51 | 12.99/106.03 | | 5./82: 1 1/2-hour cooldown | 1.97 | 8.31/86.02 | 12.89/107.08 | | PARTS AND PRICES | | Item | | Part No. | Price | | 1. 350HP Performance Pac | 28020 | $704.75 | | | SLP Loudmouth II exhaust | | | SLP Flow Pac cold-air system | | | 350HP PerformancePac fender badges | | 2. Performance Dist LiveWires | C9LS1 | 85.95 | | 3. 375HP PerformancePac | | | SLP 85mm high-flow MAF 98-00 | 23060 | 189.95 | | SLP 1.85 rockers w/springs, retainers | 51185 | 984.95 | | SLP Diablo Sport II Programmer | 27007T | 474.95 | | SLP 375HP PerformancePac fender badges | | 4. SLP fan-control switch | 63011 | 72.05 | | 5. SLP 160-degree thermostat | 100223 | 54.99 | | 6. SLP LS6 intake manifold, '98-'00 LS1 | 30041 | 499.99 | | 7. SLP 400HP PerformancePac | | | SLP tuned-length headers '98-'99 | 30051 | 899.95 | | SLP header-installation kit | 30054 | 129.95 | | SLP high-flow catalytic converters | 31037 | 349.95 | | 400HP PerformancePac fender badges | | 8. SLP subframe connectors, bolt-in | 70801 | 349.95 | | 9. Nitto Extreme Drag Radial | Jeg's #726- | 273.98 | | | 245/50R16 | 40133 | (pair) |  Ken Estelle lifts the left-side...  Ken Estelle lifts the left-side header into place. It may be necessary to remove four of the six K-member bolts (leave the two center bolts threaded in about five turns) and all the bolts to the trans X-member. Prying the rear of the trans towards the passenger side can also aid in squeezing in the headers. Sometimes the steering-column shaft U-joint needs to be disconnected from the steering box for header- installation clearance.  Here's a look at the passenger-side...  Here's a look at the passenger-side header to the wiring-harness, heat-shield-tubing clearance. It looks tight in this shot, but there's about 1/4 inch of clearance. It's important to install the heat-shield tubing to protect the wiring from frying.  As you can see, the headers...  As you can see, the headers are a tight fit, but we didn't experience any interference around them. We didn't forget to reinstall and re-torque the K-member and trans X-member bolts. We popped in SLP's O2-sensor extension harnesses prior to installing the high-flow cats and Y-pipe.
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