Well we finally had a chance to get these installed on a car and dynoed. I hooked up with Mike@ J&M Motorsports in Manchester CT and he called one of his customers that had a C5. I rolled up there yesterday to get our C5 tri Y header on the C5. Its 2004 Convertible Corvette with only a black wing lid and B&B exhaust.



Install
Very easy and straight foward. After the factory components where out we stated to install the headers. Driver side from the bottle and passanger side from the top. Slid right in. Just the altenator and start where unbolted. Tighten up the header bolts and put the alt and started back in. Hook up the x pipe with cats. Slipped right on and then bolted it up to the rear section. Install time took under 5 hrs and with us taking our time. Very clean install and excellent clearance to the oil pan and body.



Started the car up drove it around the block and then strapped it to the dyno. We didnt expect much of a dyno gain because of the car didnt have time to adjust for the headers. I like at least a week or so for everything to settled in.
Well it still did well on the dyno.
Mods before 308.4hp 318.9
Stock 04 C5, Blackwing Lid, B&B Catback
After 332.9hp 348.6tq
QTP Stainless Steel Tri Y Headers
Catalytic X pipe



A nice gain across the board. From 2000 rpm all the way to the red line. This is with NO TUNING! FACTORY TUNE RIGHT OFF THE LIFT! NO OFF ROAD PIPE!

31.2 hp and 34.1 tq @4800 rpm and an average horse power increase of 28.4hp & 29.4tq from 3800-6000. Power where you want it!

Needless to say i was happy with the results and so was Mike@J&M and so was Frank the owner of the C5. The car will be coming back to J&M in a couple of weeks to get tuning to see what we can squeeze out of it.

Here is a chart of the dyno graphs that i put in to an excel spread sheet and shows the difference between the before and after.There will be some parts of the sheet with missing rpms. Thats due to the dyno.

RPM HP Before TQ Before HP After TQ After HP Diff TQ Diff
2000 110.3 289.6 114.7 301.1 4.4 11.5
2100 115.4 288.6 121.2 303.0 5.8 14.4
2200 121.3 289.5 128.0 305.7 6.7 16.2
2300 127.9 292.0 135.7 309.9 7.8 17.9
2400 134.8 295.0 143.1 313.3 8.3 18.3
2500 141.3 296.9 150.7 316.7 9.4 19.8
2600 148.3 299.6 157.8 318.8 9.5 19.2
2700 154.5 300.5 164.3 319.5 9.8 19.0
2800 160.7 301.3 170.4 319.6 9.7 18.3
2900 167.0 302.5 177.5 321.5 10.5 19.0
3000 173.0 303.0 185.7 325.1 12.7 22.1
3100 179.9 304.9 194.6 329.8 14.7 24.9
3200 186.7 306.4 202.7 332.7 16.0 26.3
3300 193.2 307.5 210.2 334.5 17.0 27.0
3400 199.8 308.7 217.8 336.4 18.0 27.7
3500 XXXX XXXX 225.5 338.4 XXX XXX
3600 XXXX XXXX 232.9 339.8 XXX XXX
3700 XXXX XXXX 240.3 341.1 XXX XXX
3800 227.6 314.5 248.7 343.8 21.1 29.3
3900 233.3 314.2 255.5 344.1 22.2 29.9
4000 239.9 315.0 XXXX XXXX XXX XXX
4100 247.0 316.4 XXXX XXXX XXX XXX
4200 254.4 318.2 278.6 348.4 24.2 30.2
4300 260.6 318.3 284.6 347.7 24.0 29.4
4400 266.3 317.9 291.2 347.6 24.9 29.7
4500 272.2 317.7 297.8 347.5 25.6 29.8
4600 278.1 317.5 302.7 345.6 24.6 28.1
4700 280.9 313.9 310.8 347.4 29.9 33.5
4800 285.2 312.1 316.4 346.2 31.2 34.1
4900 289.9 310.7 320.5 343.5 30.6 32.8
5000 295.4 310.3 325.5 341.9 30.1 31.6
5100 298.0 306.9 327.2 336.9 29.2 30.0
5200 300.6 303.6 330.9 334.2 30.3 30.6
5300 302.3 299.5 332.2 329.2 29.9 29.7
5400 302.0 293.7 332.5 323.4 30.5 29.7
5500 303.6 289.9 331.2 316.3 27.6 26.4
5600 300.6 281.9 331.2 310.7 30.6 28.8
5700 301.1 277.4 331.7 305.7 30.6 28.3
5800 303.7 275.0 332.4 301.0 28.7 26.0
5900 304.0 270.6 331.4 295.0 27.4 24.4
6000 301.9 264.3 331.1 289.8 29.2 25.5
6100 327.2 281.7
6200 323.5 274.1

If any one has any questions please give me a call. If anyone has any install questions give Mike@J&M Motorsports a call at 860-432-DYNO.

 

damn...awesome gains!

 

Damn that's some nice gains Barry. I wish something like that would fit the f-bodies. I will end up getting a set of your headers one of these days.

Congrats. Those are beautiful that's for sure.

 

Nice!

 

Thanks guys. A little hard work and lot of blood, sweat and gears