Correct Heater Boxes

Hi Theron, I’m pretty sure I have the same VSpeed exhaust as you, and I have stock heater boxes installed. I’ll check tonight when I’m back in the garage and post photos.
Dan

I'd take the muffler off and measure the I.D. of the pipes. The compare with stock heater boxes(and no I don't know what size stock boxes are).

You wouldn't want to restrict the flow to get some heat, would you?

Along with checking the size of the heater box pipes, I’m pretty sure stock boxes won’t have flanges on them as your current muffler has, so you’ll have to get flanges welded on to the heater box pipes.

I’m gonna go out on a limb here, but those J-pipes look quite a bit larger than stock pipes so let us know what you find when you measure things.  I have some stock 1,600cc heater boxes in the shop attic if you want me to measure the pipes.

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Theron, my Vintage Speed system uses 1.5" (38mm) pipes. Decent heater boxes in this size are commonly available, but they're not technically 'stock' - which is 1.375" (one and three-eighths) or 35mm.

On the Vintage site, it looks like their systems are available only in 38mm or larger (but maybe I didn't look closely enough). There should be a part number engraved somewhere on your muffler, which would let you check the size.

One complication is that with larger than stock heater boxes, the flange that connects to the muffler may not be clocked to line up with the holes in the muffler. (I got my heater boxes from Aircooled.net and they warned about this when I ordered.) The flanges then have to be cut off the heater boxes, reoriented to line up, and then rewelded on. Here's what that looks like on mine:

These are good quality heater boxes. They're heavy and provide good heat, so they probably have decent fins inside.

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Or if you don’t want to cut and weld, Vintage Speed does sell a heater box flange adaptor.   I used these on my VS, with VS exhaust and stock heater boxes, 42$… Jbugs or Aircool.net used to carry them as VS US distributors… or you can order directly from VS.

https://store.vintagespeed.com...-ADAPTORS-p132804143

It looks to me as though you may already have the VS flange adaptor???  

Just got back from work and took a couple of photos of mine.  Heater box pipe size is around 38mm, the VS exhaust pipe size (on mine) is 43mm.  Not sure if these are standard boxes; they have a weird pipe emanating from the side......possibly were once hooked up to the kombi blower motor I've just removed.  

Thanks @DW, @Lfepardo and everyone else. This was really helpful.  As soon as the car is back from the body shop I will take some measurements. Looks like https://store.vintagespeed.com...TER-BOXES-p150921239 may be the exact bolt-on I need.

-=theron

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Cool.

Wish they offered those boxes and the delivered-to-fit service when I got mine.

But I guess enough people asked for it, so...

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Good eyes @DW . Looks like a flange adapter is already installed.    My VS has the stock heater boxes installed with the adaptor.

My car has Dansk 1-1/2" diameter heater boxes that had flanges on them for the old Tri-Mil I was running. When I switched to the Vintage Speedster exhaust we accommodated it to the existing flanges with their adapters.