Jamie, do you expect the cats in your future catted headers to withstand nominal track use? I seem to recall other vendors hedging on that.

 

We keep tweaking the tune a bit as we get time. Will finalize it over the weekend.

Here's where we're at so far vs the stock car


+65whp and +47lbft at 7200rpm

Dundon GT4 Race Headers w/ Dundon Pro Tune vs Stock

+47whp and +64lbft at 3900 rpm

Dundon GT4 Race Headers w/ Dundon Pro Tune vs Stock


+50whp and +53lbft at 5000rpm

Dundon GT4 Race Headers w/ Dundon Pro Tune vs Stock


+41whp and +34lbft at 6200rpm

Dundon GT4 Race Headers w/ Dundon Pro Tune vs Stock


We're going to try and make a track day on the 17th if the weather cooperates, we drove it briefly on the street "in mexico" and it's head snapping amounts of gains...

 

I would say for track use with cats it's important to have a tune, over fueling and retarded timing will make for very very hot cats on the track and that's what kills them.

2-3 times a year I wouldn't think would kill them, but that all depends on track, driving etc.

No cat is truly immune to the race track, we'll look at what the warranty coverage would be once we test them as far as track usage...

 

That little loopty-doo between 1800 and 2000rpm has got to be an epic feeling!

Truly remarkable improvement from a tune and headers.

 

Go back in time !
Awesome, awesome work.
what is the net avg gained through the rpm's band ?

 

When I catch a breath, I'll export in 5 rpm increments and get an average gain over stock throughout the rev range as well as a stdev for the population...

 

There are so many amazing contributions in this thread and we've even come full circle to a happy ending - more power! The transparency, innovation, participation, and support from DMS for our relatively small community is incredible. My shop gave me some grief when I told them to expect a set of DMS headers (instead of one of the less expensive and more established options available) but I'm thrilled to support a company like DMS that's on a mission to design exceptional products, get their hands dirty and build them domestically, and contribute intelligently to the community as well. Thank you!

 

When I dropped my car and headers off to the installer he inquired about the 4th pipe. I told him it was part of the future.

 

I need a new hobby. This is killing me.

I wish I was just a skate board junkie at the age of 47.

 

I'd be happy to be 47 again.

 

Just read through most of this thread but cant see any owners impressions yet. Has anyone fitted them? Give us some feedback!

 

Most just shipped in the last couple weeks. I think Alan may be one of the first and then they'll likely be 4-5 more in the next week or two...

 

When will the next round be available? How easy is the flashing of the tune? (in reference to going to stock for stealership visits)

Thanks!

 

Man those graphs are unreal. I am so excited!

 

Rather incredible gains from a set of longtube manifolds; according to my math these would make my car produce 510 HP at the crank! I would love to get my hands on a set to test and dyno back to back vs other brands. Could we make it happen? I would have a non-biased 3rd party do the analysis and would be transparent with all findings.