502 HO Mag 430 hp catalyst upgrades

[Captainervin]

Has anyone done any upgrades to the 502 HO Mag 430 hp catalyst motor?

 

[BHC Vic]

Has anyone done any upgrades to the 502 HO Mag 430 hp catalyst motor?

I believe there are two boats on here that have done it. I'll see if I can find the link. I'm going to do it to my boat just not quite yet... Actually sorry I misread... Those were not ho's

 

[CoolCruzin]

I hear the exhaust is a good upgrade . But don't know . The stock exhaust manifold are a bit over 300lbs..
lot of weight to get rid of

 

[Sbarry]

I hear the exhaust is a good upgrade . But don't know . The stock exhaust manifold are a bit over 300lbs..
lot of weight to get rid of

You do it first, yours can be the test boat

 

[CoolCruzin]

You do it first, yours can be the test boat

lol, I hate that part .But at the end of the year seems like a good time .

 

[jack14r]

I did the Whipple stage 2 to a 380 HP 8.2 and took out the catalyst,it is perfect with about15-20 hours on it.Mine is a 2011 boat so it has the 3 catalysts on each side and it was not a digital motor so I had to machine the restrictor to the size of the throttle body.search 8.2 Mercury and you will find some info on here.

 

[Captainervin]

Thanks.

What boat is that in the picture?
Looks like mid cabin open bow.

 

[jack14r]

No it is a F32 with 1335 Teagues the 8.2 is in a Cobalt A25.