Spark plug Bosch or OEM Mazda

Bosch F3cs @27psi no issues and no gapping

I pulled the plugs this morning and replaced them with Bosch cooper plugs, the only match that was available in local Autozone. There are no more misfires (for now), which makes plugs the culprit.

Currently Running Bosch - Fusions - for Spark those seem to have Smoothed the Motor - 1 step Cooler .

The plug they sent me (Bosch #4417 FGR7DQP Platinum +4) runs absolutely fine on my engine, actually it feels better then before, but I just worried if it is indeed not the correct plug, will it do harm to my engine?

The Bosch side fires are an AAN plug that has a removable top. I will probably use those, they worked great with my B5 S4.

I've been using bosch FD5POR aka rs2 plugs. I'm quite pleased with them.

Bosch FR8DC+ perform well and you won't have to worry about seized plugs. You might have to change them sooner.

I'm a technition with many years under my belt.... and had numerouse out of the box brand new BOSH plugs that upon installing them were dead, not just one but two in the same set, i would then take em out, check gap, and spark test the plug wires and coil, swop them to a diff cylender and bam.. still crap, im not trying to knock them and im not and NGP rep, im speaking from experience

iv had mor problems with a brand new bosh plug then any other plug.. even cheap knock off checker brands...

Every time I fill up I check my mileage, I could never get great MPG from the FR8DS, but the coppers were way better MPG wise. Throttle response was less as well. The Silbers always looked more sooty during inspections than the coppers. The silver plug will last longer.