DPI Spec 1 Review

[DMCVegas]

Are you missing a catalytic convertor? Or is your's on the non-approved aftermarket list?

I believe that it's a requirement to have the stock catalyst it was equipped with from the factory to remain in place for at least 8 years before you can remove it. You must still reinstall one in it's place of course, but California does allow for the modification of exhaust systems as long as the factory-equipped emissions equipment remains in place. Failing you just because an aftermarket system is installed without verification of the catalytic convertor doesn't seem right.

http://www.arb.ca.gov/msprog/aftermk...ftermktcat.htm

[kobachi]

What is the HP increase of the DPI Spec 1? Comparable to the ~20HP gain claimed by DMC-H Stage 1?

[David T]

It is not all about raw HP. The Stage I from DMCH also increases the torque and that's where the fun factor really is. And the sound. I can't speak to the DPI version having never seen or driven one.

[sdg3205]

I think (like mine) a lot DeLoreans are driving around on melted cats, literally strangling the output of exhaust gases and power.

Going to a new, less restrictive exhaust makes a substantial difference.

[kobachi]

It is not all about raw HP. The Stage I from DMCH also increases the torque and that's where the fun factor really is. And the sound. I can't speak to the DPI version having never seen or driven one.

Thanks David. Is there reason to believe that the SPEC I would not also bring a torque increase?

[Chris Burns]

This is a video I made of my friends new DPI Spec 1 exhaust when he first had it installed by a local mechanic.

https://m.youtube.com/watch?v=iybJx2Ln7ec

It sounds great and roughly adds 20 more hp. If you go this route make sure your ceramic coat the exhaust system. It's extra money but you won't regret it!!

[kobachi]

make sure your ceramic coat the exhaust system. It's extra money but you won't regret it!!

What's the purpose of the ceramic coating?

[Chris Burns]

Helps the exhaust last longer, look prettier longer, and helps keep engine heat down. Especially around important engine components such as the starter.

[Delorean Industries]

Owners typically see an increase of 17-21 hp and 20-30 ft lbs of torque with our system. This is completely dependant on over all engine condition etc. Ceramic coating is now a direct option offered by us as well.


Exhaust system complete
https://deloreanindustries.com/spec-i-exhaust/

Ceramic coating add on
https://deloreanindustries.com/delor...c-coat-add-on/

[David T]

As I understand the DPI upgrade, it is similar to the DMC Stage I so results should be similar. As I said, not having seen the DPI one or driven one I can't comment on it. My comment was only to offer that it is not all about HP. How it feels, sounds and what it costs are part of your decision making process. And as DPI points out, don't expect a tired, worn out motor to suddenly be rejuvenated, you should only do the upgrade on a healthy motor and a car that is in reasonably good general shape. Now, if you overheated a good motor then that might be a good time to consider doing this kind of upgrade since you have to pull the heads anyway. Whichever you choose it gives a noticeable increase in performance. Not as much as a turbo but a good bit more than a stock motor.