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Thread: Delorean Performance Industries Spec 1 Stainless Steel Exhaust

  1. #1
    Senior Member
    Join Date:  May 2011

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    Post Delorean Performance Industries Spec 1 Stainless Steel Exhaust

    I thought I would wait until a few months of use to review this exhaust.

    Who else has this exhaust?

    It has met my expectations. I have not heard any exhaust leaks/ticking over the past couple thousand miles that I have used it. Thank you very much Josh Bengston for making this available!

    The installation fitment was excellent becaust DPI test fits each exhaust before installing, so I had no problem once I put it on my car. However, be fore-warned that you have to clean out all of the cylinder head exhaust stud threads very well as this exhaust takes advantage of all 4 per cylinder. This took me a lot of time to complete. You may also want to use lock-tite or lock washers to keep the studs and nuts from backing out or coming off of the headers; I know from experience.
    The headers were designed well so that you can easily tighten all of the nuts down with a wrench or socket. You want to put everything together loose before tightening; the muffler brackets, converter pipes, headers, etc. It's a slight pain at first but it all fits together well. Also, you have to reuse the original bracket "doughnuts" that bolt to the exhaust brackets and that the hangers from the exhaust slide into. I experienced some necessary persuasion on getting the doughnuts off and on the original and new exhaust hangers....

    One other thing that I would add is that you need to make sure the heat shield on the muffler is tight and perhaps use lock washers or lock-tite. Otherwise the bolts will back out and you will have an annoying vibration; again, I know from experience. Also, by having the bolts tight, the shield will bow a bit because it can't expand/contract with the exhaust heat of the muffler. Perhaps slotting the holes will allow it to adjust to the hot/cold temperatures; but it's nothing major to worry about.
    The exhaust note is very deep at idle and low reving rpms. The interior resonance is minimal when cruising on the highway, which is a plus for me.

    There are two welded bungs, one each on the headers. The stock oxygen sensor requires pulling the wire out of the firewall some, but it will still work. You can add an extension if you wish. The otherside is handy for using a wide-band sensor or tuning; a nice option to have available.

    Performance-wise I definately noticed a difference going from the stock exhaust to the Spec One exhaust, especially when I have the upgraded DMC CA cams and did port/polish work to the cylinder heads.

    Also, my stock exhaust had a cat-delete pipe. My wife and I would notice that the garage would smell like gas after turning off the car and closing the garage door. With the Spec One exhaust, that smell is no longer noticed. The catalytic converters do not hinder performance and also absorb the fuel smell instead of your clothes, hair, and eyes...plus they are smog-friendly for those who need it.

    Overall this is a great product; high quality, excellent fitment, good looks with a nice clean/tight/tucked design, excellent sound, and great performance.

    Josh Q

    Pictures below:











  2. #2
    Canon20DFan
    Guest
    I have this exhaust, very nice throaty sound at low RPMs but smooth and quiet at highway speeds. Very nice fit and finish.
    Chassis_2.jpgChassis_1.jpgChassis_3.jpg
    Last edited by Canon20DFan; 09-26-2011 at 12:25 PM.

  3. #3
    Not dead yet, also Admin. sean's Avatar
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    I like the look for sure but Wilson's looks shinier. Is this a camera trick or is he selling two different finishes?
    eBay selling at it's best I can tell you stock Delorians and quite a bit of slugs so the Turbo is a super nice up-grade.
    K-Jet: Causing electrical issues since November 5th 1955

  4. #4
    Senior Member
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    Post

    He has the ceramic coated version that costs more.
    I made an economical decision and ordered mine plain stainless steel.
    His exhaust and car are really nice looking!
    Last edited by DeloreanJoshQ; 09-26-2011 at 03:27 PM.

  5. #5
    Canon20DFan
    Guest
    <blush>
    Realize I had an entire engine refurb done at DPI with the appearance option. It sure didn't look like that when it was towed in there...
    Quote Originally Posted by DeloreanJoshQ View Post
    He has the ceramic coated version that costs more.
    I made an economical decision and ordered mine plain stainless steel.
    His exhaust and car are really nice looking!

  6. #6
    Senior Member Fluxat88MPH's Avatar
    Join Date:  May 2011

    Location:  Dayton, Ohio

    Posts:    111

    One thing I noticed about this exhaust visually is that the exhaust pipes seem to be real short and just barely make it past the bumper. It sounds real nice but seems louder to me in the cabin area to me than what I am used to. Im running the UK SS set up so I am used to that sound. Other than that it seemed to be a nice set up.

  7. #7
    President, DeLorean Industries
    Join Date:  May 2011

    Location:  CLE/PHX

    Posts:    2,236

    My VIN:    5646,5080, 5880, 10234, 3639, 2518, 10586, 1538

    Glad to see so much positive feed back on this system. Just to take out the confusion on the issue our systems are exclusively produced for DPI to our specifications by Stainless Works here in Ohio.
    We sold a number of used Houston Stage I systems recently and owners are under the impression these were also produced by SW. This is not the case. As far as I know Stage I kits are produced in Lancaster CA by Thermal Research and Development. Our systems have nothing in common other then the fact that they are dual in dual out. Parts are not interchangeable either.

  8. #8
    Formally hmm252000
    Join Date:  May 2011

    Location:  Hillsboro, OR

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    My VIN:    4099

    Club(s):   (PNDC)

    I too have been very happy with mine. However, to correct the OP, you only need two studs per exhaust port. Nothing wrong with doing all 4, but the standard kit only comes with two studs per port. In my case, I left the original studs in place as I didn't want to deal with them and used the unused locations for the new studs. It's not as nice looking with the old studs still there, but most won't notice.

    As for the heat shield bolts, I've lost about 6 of them on the road as they backed out. The current ones I have in there now have both lock washers and thread lock. So far so good! But that's been my only issue with this system. Otherwise it's been fantastic and I highly recommend it as well!

  9. #9
    Junior Member
    Join Date:  Dec 2011

    Location:  Huntsville, AL

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    My VIN:    17009

    Quote Originally Posted by Chris4099 View Post
    I too have been very happy with mine. However, to correct the OP, you only need two studs per exhaust port. Nothing wrong with doing all 4, but the standard kit only comes with two studs per port. In my case, I left the original studs in place as I didn't want to deal with them and used the unused locations for the new studs. It's not as nice looking with the old studs still there, but most won't notice.

    As for the heat shield bolts, I've lost about 6 of them on the road as they backed out. The current ones I have in there now have both lock washers and thread lock. So far so good! But that's been my only issue with this system. Otherwise it's been fantastic and I highly recommend it as well!
    Mine did the exact same thing. One of my heatshield mounts actually snapped off due to the vibration and the bolts being locked in place. I have the car in the shop right now and Josh is gonna fix the problem so I'm happy.

  10. #10
    President, DeLorean Industries
    Join Date:  May 2011

    Location:  CLE/PHX

    Posts:    2,236

    My VIN:    5646,5080, 5880, 10234, 3639, 2518, 10586, 1538

    The problem we have found with the hardware coming out is mainly due to it not being checked post install. Most times the shield is only installed finger tight by SW when manufactured. Unfortunately owners think it is fully installed. Hardware falls out and then is reinstalled after the shield has bedded in after a heat cycle. This can cause extra stress on the welded z brackets and cause a break to occur. We are now supplying a check list with the system of fasteners to check during install prior to starting.

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