Here's the chart from my car. Bone stock vs. just headers, no other changes

Engine RPM Torque-Baseline HP-Baseline Engine RPM Torque-DC Header HP-DC Header Torque HP

2000 235.6 90.6 2000 232.7 89.6 -2.9 -1
2100 234.3 93.6 2100 232.5 93.4 -1.8 -0.2
2200 236.8 99.1 2200 236.3 99.2 -0.5 0.1
2300 240.1 105.4 2300 243.5 106.8 3.4 1.4
2400 239.8 109.5 2400 243.5 110.9 3.7 1.4
2500 238.2 113.1 2500 241.9 115 3.7 1.9
2600 238.7 118.1 2600 242.3 119.9 3.6 1.8
2700 241.6 124.3 2700 242.8 124.8 1.2 0.5
2800 243.8 129.9 2800 242.4 129.4 -1.4 -0.5
2900 245.4 135.9 2900 244.9 135.3 -0.5 -0.6
3000 247.1 141.6 3000 247.1 141.2 0 -0.4
3100 247.2 146.2 3100 246.2 145.4 -1 -0.8
3200 247.5 150.6 3200 246.1 149.8 -1.4 -0.8
3300 247.5 155.4 3300 246.3 154.8 -1.2 -0.6
3400 247.9 160.5 3400 247.8 160.8 -0.1 0.3
3500 248.4 165.6 3500 251.1 167.4 2.7 1.8
3600 249.3 171.3 3600 254.5 174.7 5.2 3.4
3700 249.7 176 3700 258 181.7 8.3 5.7
3800 249.4 180.8 3800 260.6 188.3 11.2 7.5
3900 251.3 186.7 3900 261.2 193.6 9.9 6.9
4000 253.7 193.1 4000 261.3 198.7 7.6 5.6
4100 254.8 198.8 4100 263.1 204.7 8.3 5.9
4200 254.6 203.7 4200 264 210.4 9.4 6.7
4300 254.3 208.1 4300 262.1 215.1 7.8 7
4400 254.4 213 4400 263.2 220.3 8.8 7.3
4500 255.7 218.9 4500 262.5 225 6.8 6.1
4600 255.2 223.5 4600 261.8 229.1 6.6 5.6
4700 253.2 226.3 4700 260 232.7 6.8 6.4
4800 251.2 229.5 4800 257 234.7 5.8 5.2
4900 248.5 232 4900 253.5 236.3 5 4.3
5000 245.3 233.4 5000 250.3 238.1 5 4.7
5100 241.7 234.9 5100 246.2 239.2 4.5 4.3
5200 241.2 239.2 5200 243.1 240.8 1.9 1.6
5300 241.2 243.4 5300 241.9 243.8 0.7 0.4
5400 237 243.8 5400 239.9 246.7 2.9 2.9
5500 232.3 243.3 5500 237.1 248.2 4.8 4.9
5600 226.9 241.9 5600 233.8 249 6.9 7.1
5700 222.3 241.2 5700 229.9 249.8 7.6 8.6
5800 218.9 241.5 5800 226.4 249.9 7.5 8.4
5900 215.3 241.8 5900 223.5 251.4 8.2 9.6
6000 210.8 240.8 6000 221.8 253.2 11 12.4
6100 204.6 237.6 6100 214.5 249 9.9 11.4
6200 197.2 232.9 6200 207.2 244.1 10 11.2
6300 191 229.3 6300 199.7 239.3 8.7 10
6400 187.9 227.6 6400 195.1 236.3 7.2 8.7

 

looks like 5 upto peak, then it goes upto about 10 at redline. looks good for the price. i'll probly just put my borlas on though.

 

I've had the DC Sports Headers on for nearly a week now. After 3 days or so the power really kicked in. Just as with the pully's and exhaust install, the computer took 3 days or so to realize the increase in power. It is very very apparant now. The power after 4k is great, pulls quite a bit harder than before. Go with DC sports for the money and nearly 12HP you can't go wrong.

 

Why do nismo, stillen and crawford cost so much more?

 

nismo and stillen for the name and "quality" crawford because their a great product, even though their not widely known. Crawford has excellent service and products from all that i have read.

 

2 people with the DC headers and no pics? Could either maserom or 350Zteve try to get a few pics? TIA

 

The pics of the crawfords look like crap. All those welds.

 

Have you seen the pix of the NISMO? Not the greatest set of welds either.

 

Hand-built headers... with no welds?

I'm confused.

 

What are the lines on these headers?

 

DITTO that!

 

Ummm those would be welds

 

Superspring E46 M3 Headers... $1928



Welds?



Breathless Z06 Headers... $1450


<cough> Welds <cough, cough>

Guys... seriously NO MACHINE can bend tubing extremely tight. The headers you are seeing on ANY car with NO welds... are nice smooth mandrel bent setups with lots of room for pipes.

No V-powered Z has that room...

i.e. Stillen Headers... Z32 Non-Turbo

 

Love my Crawford headers(and cats)......plus the service with CrawfordZ is superb! Great guys, great product, great service!

 

The extra welds are necessary. Mandrel bending machines cannot do compound bends unless they are generally 3" apart from eachother.

The machine needs the 3" or so of straight tube so it can grab it for the next bend, so if you have a 90 degree bend coming out of the header, followed by a 30 degree bend shooting off in another direction, they must be bent seperately then welded together.

This is why you dont see seams in headers like the borlas, or most of the "honda style" headers because they dont have close compound bends.

 

Those are the Crawford headers? Those are nice. Looks like professional work to me. Who was complaining?!

 

Sorry I don't have any pics yet. I had them installed at DC, so I never had the headers at home where I could take pictures.

I can tell you this, they are some of the nicest fabricated peices I have seen. The flanges are completely CNC'd and all the welds are done on CNC robot welders. Very percise welds, very clean.

 

Well, I would like to know which headers fit well with an SC. I think that is on a lot of people's minds. I would think the crawfords, but I would really like to see crawford post some dyno results of just the headers, like 350Zteve just did for the DCs.

 

DC sports headers in the past have always been of very high quality in my experience.