TTI vs Dougs

gabe380 said

I know that there are countless threads about this, but I have a question that I haven't been able to find an answer to yet.

Both TTI and Doug's offer a ceramic coating option, but TTI also has the option for a "thermal barrier" coating to be applied to the inside of the headers. Supposedly this thermal barrier creates better airflow through the headers, as well as reducing the overall underhood temp.

Just curious if anyone has used both of these products, and has noticed any worthwhile improvement/benefits with the "thermal barrier" version of the TTI's.

I would just buy the TTI's and forget about it, if it weren't for the fact that TTI says that their 340 headers won't work on a 318. I have a 318 now, but will likely be swapping to a 340 at some point, and really don't want to have to buy a second set of expensive headers.


Gabe

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I'm not sure about the coating part of your question, but i can't understand why TTI would claim that the headers won't work on a 318.
They may not be optimum for the port size difference, but claiming that they ''won't work'' on a 318 is hogwash.
There is lots of meat on the sealing surface of a 318 head to accommodate the bigger tubes and flange.
In fact, i do have a cheaper brand of header on my A-Body 318 (Flowtech, don't buy these, they are designed for a B-Body i found out later!) that is also designed for a 340/360 engine and had no issues with the sealing to the head issue, my issues were hitting the steering box and coupler, torsion bars, and oil filter. Cheap headers are a nightmare to say the least...........
I would say that a 318 sized port header wouldn't work on a 340 or 360 port size engine, not the other way around.
I would call TTI and i bet they say that it's a misprint.