Loading... Please wait...


Riffraff Diesel Performance Inc, Engines - Supplies, Equipment & Parts, Eagle Point, OR


  Our Newsletter

Garrett PowerMax GT3788VA Stage 1 Turbo 04-07

  • Garrett PowerMax GT3788VA Stage 1 Turbo 6.0L
Your Price:
$1,248.44 (You save $497.63)
Part Number:


Garrett PowerMax GT3788VA Stage 1 Turbo 6.0L Power Stroke engine (04-07)

  • Features the Garrett® patented Advanced Variable Nozzle Turbine (AVNTTM) design for increased compressor flow and boost response
  • Utilizes nine movable vanes which significantly increase turbine efficiency and improve engine performance from idle launch through peak torque
  • Patented integral electro-hydraulic actuation and proportional solenoid for infinitely variable control
  • Larger compressor wheel over stock increases maximum power range while keeping turbo speeds down for the same power output
  • Supports up to an additional 175 HP over stock with no sacrifice in drivability
  • Suitable as a performance upgrade or replacement for original equipment
  • Outline interchangeable for a perfect fit each and every time


Model years 2003 (PN 777469-5001s) built 9/29/03 and before, 2004-2007 (PN 772441-5002s) 6.0L Power Stroke engine

*Picture is provided by Garrett/ Compressor housing isn't polished as shown.

Write your own product review

Product Reviews

Showing reviews 1-10 of 34 | Next

  1. Bad ass 5 Star Review

    Posted by on Mar 1st 2018

    Great powerful product, got the sound and power I was looking for, great product... thanks fellas

  2. great product 5 Star Review

    Posted by on Dec 1st 2017

    great product quick shipping

  3. Powermax Turbo 5 Star Review

    Posted by on Nov 20th 2017

    Awesome product extremely more fun than stock and went in as easy,lined up perfectly. Best price I could find anywhere! Only thing I didn't like is the box was really banged up and a big heavy expensive turbo needs better care when shipped!

  4. Awesome product and Excellent CUSTOMER Service 5 Star Review

    Posted by on Oct 31st 2017

    The product is great and the price is the best out there. The customer service from RiffRaff is excellent, I called left message and in a very timely manner returned my call. The call was quick and efficient and I was very happy.

  5. Replaced stock turbo with Garret Powermax 4 Star Review

    Posted by on Jul 6th 2017

    Shipping was very fast and price was unbeatable. I got tired removing my stock turbo and cleaning it every 2 years to clear codes so I replaced it. This turbo whistles non stop and gets people looking. I lost about 8 psi of max boost, but it makes boost lower and faster, 20-21 psi max. Combined with my tune and bolt ons, this truck pulls hard.

  6. 04 powerstroke 4 Star Review

    Posted by on Jul 2nd 2017

    This turbo seems a lot better than the stock one milage is good.Cheaper than Amazon.

  7. Didn't know what I was missing! 5 Star Review

    Posted by on May 25th 2017

    Bought a 2005 F250 and figured there would be some repairs..But when I needed a turbo I searched and found this at RiffRaff. Price was great but their ability to overnight it to me AND answer questions about the install was beyond what I expected! I'm not only a customer for life, I'm and FAN! Thanks to Clay and the whole team at RiffRaff!

  8. Excursion 6.0 5 Star Review

    Posted by on May 16th 2017

    I'm happy with this purchase it arrives fast and it works awesome very happy with the whistle

  9. Best purchase ever! 5 Star Review

    Posted by on Apr 18th 2017

    I'm in love with my powermax turbo! Thank you very much for your honesty. This was shipped less then an hr after I ordered it. Was on my doorstep 2 days later in MN. I paid over $70 for shipping because I needed it quick & was still cheaper than all the places with free shipping! Thanks again & I look forward doing business with Riffraff again.

  10. Know what you're getting 5 Star Review

    Posted by on Mar 10th 2017

    This is as much a review for Riff Raff as it is the turbo. I needed a new turbo stat and looked all over the internet once I had decided on a Powermax for my 05. Not sure why I didn't run across Riff Raff sooner but I almost bought from some place back east. Luckily they didn't have it in stock and wanted a week before they could send me one. Riff Raff had one to me in 2 days for $150 less. Impressive. I'll be using these guys in the future. The turbo itself was as advertised. Pretty easy to install, make sure you have a gasket and o-ring set which is not included. There's a slight power increase which has been noticeable even at take-off. The whistle is markedly louder, but I've got a 4" turbo-muffler 5" muffler-back with 6" tip exhaust. Not sure how different it would sound with stock exhaust. So far the best improvement is EGT's. +-100° decrease in EGt's under heavy load. Turbo boost pressure has also increased. I've got a max of 30psi on my Edge W/attitude programmer readout, a 3psi increase. This thing moves some air especially over stock. If you're wanting or needing to get a new turbo, but don't want to break the bank, get this turbo. If you want a performance turbo upgrade but don't want to blow your 6.0 to bits, get this turbo. If you've got more money than sense, if you need to compensate for your non-existent manhood or if daddy foots the bill for your truck habit, shop elsewhere.

Showing reviews 1-10 of 34 | Next