It does not hurt to have them pop tested but I never have and the Bosio's work flawless.

Next up is new Bosio's in a smoking 603 engine. I will take some before and after video to show the improvement.

The 603 smokes like a train when cold started. Runs great though, but I dont like all the smoke.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair