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Forced Induction SystemsDetailed discussions regarding cold-air intake systens, superchargers, turbo chargers, and other induction systems for your vehicle.
This is a discussion thread titled "Doug Thorley 5.7L Headers", within the Forced Induction Systems forum, part of the Technical & Vehicle Assistance Forums category.
Hello guys,
I am new to TundraSolutions.com and I was referred over to this forum from Customtacos.com if you are familiar with that site. But was told I would get the best feedback from this forum. Just recently we developed headers for the 5.7L Tundra and actually have them available now. But I wanted to see what people thought of them.
We developed these headers from the ground up, we used a "True" Tri-Y design that increases torque and horsepower lower in the RPM range where it really matters. Our increases were 28hp and 46lb.ft. of torque. I will attach the dyno sheet and pictures for you guys too. The header primaries are all equal length as well. Tell me what you guys think?
The gains are found "under the curve" for the most part. The peak increases are not that impressive if we are simply looking at max output, but an over 40 lbft tq increase and 30 hp between 2000 and 3500 rpm or so will definitley be noticeable. You'll definitely pull on a stock tundra in a race. I would like to see numbers with an intake and catback.
The gains are found "under the curve" for the most part. The peak increases are not that impressive if we are simply looking at max output, but an over 40 lbft tq increase and 30 hp between 2000 and 3500 rpm or so will definitley be noticeable. You'll definitely pull on a stock tundra in a race. I would like to see numbers with an intake and catback.
This is correct. The truck pulls REALLY hard in the lower gears where it really matters. Peak gains are ok, but it is rare when a big truck is revving out to 5K RPMs.
How difficult or easy is the installation? And which Cat-Back system do you recommend be paired with these headers?
Installation is pretty easy, but easy to me would be hard to another. Its easy in that there is no welding or cutting involved. Completely bolt-in with no modifications. But the space is cramped due to the HUGE heads of the monster engine stuffed in there. It uses the Toyota factory gaskets which seal the best, thus we decided to not mess with that aspect. But I would still recommend taking it to a reputable shop if you are not very mechanically inclined.
Hey LSKustumz, I saw you over on CT. Good to have you here! Those are indeed some great gains, how hard would you say the install is? Seems pretty crowded in there! Do you plan on offering any group buys cause I can't just drop 600 bucks right now lol
Hey LSKustumz, I saw you over on CT. Good to have you here! Those are indeed some great gains, how hard would you say the install is? Seems pretty crowded in there! Do you plan on offering any group buys cause I can't just drop 600 bucks right now lol
I had thought about that. It depends how many people we can get together to get in on the buy. Just like the 3.4L, the more people we get together the lower the price. Its possible to get a much lower price. I would say 20 people would constitute a good discount!!
Hell yes!..might be hesistant to drop a set on under warranty, but the ceramic coated inside and out DT's were the only pipe on my jeep 4 liter that didn't crack and the mid range was noticible over another brand of pipes.
pipes that are tuned to work well at an engines peak TQ rpm run the best on fully weighted street vehicles.
I want them! I'm assuming the $604 ones were the stainless steel ones?
Can anybody tell me if in the long run the stainless are going to be worse than the ceramic ones?
Edit: I know exhaust does not void warranty, but do headers? I know about the Magnusson-Moss act, but can anybody tell me how hard that would be to prove to be the header's fault?
-rockstate
Last edited by rockstate45; 09-24-2007 at 11:17 PM.
Doug Thorley 5.7L Headers
I will attach the dyno sheet and pictures for you guys too. The header primaries are all equal length as well. Tell me what you guys think?
Linear Mode
