This is more of a review of TPM than of the test pipes. I haven't actually installed them yet but they look great, clean welds all around. Now on to TPM. I messaged them about the availability of the test pipes, was told it was indeed on back order just like every other site. What made me go ahead and choose to buy through them? Free shipping baby. The only place I saw after visiting at least 20 other sites, that offered the free shipping option. So with that deal I decided to go ahead and buy from them fully expecting to wait 2 or 3 months before actually seeing what I brought. I brought the pipes start of Feb. About 8 days later got a surprise notification that my package was on the way. Like magic I got my test pipes in 2 weeks, not 2 months. As I write this I was expecting to be getting that notification around right now, instead I'm foaming at the mouth to install them. Great service, great deal. Just wish they carried more mods for my G37, would definitely have more purchases here if they did. Hopefully that changes one day!