Finally a kit that will take the heat and resist CORROSION! These specially alloyed heat-treated "ARP 300" stainless steel bolts are nominally rated at 180,000 psi tensile strength to provide a substantial extra margin of safety over Grade 8 hardware. ARP “Stainless 300” is specially alloyed for extra durability. It’s polished using a proprietary process to produce a beautiful finish. Highly recommended to apply moly lube to the threads when installing these studs.

Each set Includes:
M8x1.25 Studs - 4pcs
12pt M8x1.25 Nuts - 4pcs
Matched Flat Washers - 4pcs

Because we've already been asked - We're currently waiting on the production run of 10mm studs for those of you who are interested.

Also coming - A complete exhaust manifold stud kit. (We are a Stage8 dealer and will update this thread with the optional hardware)

Now in stock, purchase here: PRODUCT LINK

 

Not inconel=useless on a miata?

 

Not the case - there are plenty of builds that are utilizing Grade 8 hardware offered by BEGI, this is simply a step up in strength and it won't rust like a Grade 8.

As a general observation, stud failure usually goes hand in hand with drivetrain movement and exhaust hangers. This is what makes the Miata more susceptible with it's first exhaust hanger being far from the engine and the OE engine mounts allowing the drivetrain to travel so much travel under load/shifting.

 

Inconel does not rust for the same reason stainless does not rust (high chromium content).

 

It really annoys me when people (companies?) list tensile strengths of bolts in psi, as this has almost no meaning to everyday folk. Almost everyone knows the ASTM, ISO, etc. etc. grading standards for bolts, so it makes more sense to list your product by that standard. I don't understand why people (companies) choose not to do that.

Anyway, 180,000 psi is equivalent to a Grade 12.9 bolt. Well, maybe, it depends on the ductility of the bolts/studs. Maybe that's why they're not listed as equivalent to 12.9, maybe they have the tensile strength but not the required ductility to be considered a Grade 12.9 bolt.

Not trying to knock anyone, or anything here, just trying to add a point of reference. This kit is basically stainless 12.9 studs. The parts look very nice and for the price it seems like a pretty good package for your average street turbo miata.

 

Correct (Savington) - Thanks.

Side note - We aren't shooting to replace a set of hardware that costs more than four times what this does. It's just a step up in value form some of the other similarly priced kits on the market. I personally got away with Grade 8 just fine on my car with a dozen or so track days before going v-band.

 

I couldn't agree more - My ARP rep left me with very little information so we did our best and communicated what we were working with. Thank you for the translation.

 

First 6 kits shipped - tracking issued.

 

As a follow up to our recent Turbo Hardware Kit, we've decided to offer Stage 8 locking fasteners to complete your search for reliability! Now in stock.

You can purchase with or without our Custom ARP Turbo Stud Kit:
INDIVIDUAL LOCKING FASTENER KIT
TURBO STUD KIT

 

Back in stock - back-orders shipped today.

 

My turbo flange came tapped for M10, what's chances of you carrying a fatter stud kit?

 

PS - The 12 point nuts don't work especially well on some manifold/turbo combinations. On my FMII setup I was only able to use two or three of the supplied nuts and had to swap out for standard six point nuts because there was no room except for the open end of a wrench.

Other than that this kit seems to be holding up fine for moderate street use on an older FMII kit on an NB.