More power

**Jrowe0831** · 01-05-2017, 09:40 AM

I have a 96 mariner mag 2.5l 200 HP. Is there any mods I can do get 225 or 250 HP out of it? Is there a 225 or 250 2.5l powerhead that I can bolt on? Any help and advice will be appreciated. Thanks

**Jrowe0831** · 01-05-2017, 11:03 AM

Has anyone tried the Dyno-Boost performance chip? Or is it just B's. I would like to just swap powerheads I just don't know what years will fit. But if I had to rebuild the 2.5l block, where can I get good aftermarket/performance parts. Thanks

**outasite** · 01-05-2017, 11:07 AM

Member here "American ram" I think has a brand new 225PM powerhead for sale.Buy his sell yours,The PM platform is hard to beat.

**rock** · 01-05-2017, 11:10 AM

What kind of boat and how do you use it. Above advice is spot on.

Rock

**Jrowe0831** · 01-05-2017, 11:19 AM

Well that's part of what I am asking. What years powerheads in the 225hp through 250 HP range will fit my 2.5l. correct me if I am wrong but 3.0l powerheads will not fit on a 2.5l right? I don't want to get another hole engine, I just replaced everything in my lower unit. Any help will be appreciated

**Jrowe0831** · 01-05-2017, 11:21 AM

My boat is a 96 nitro savage 896. I fish out of it but I like going fast also lol.

**outasite** · 01-05-2017, 11:29 AM

Any 2.5 of any HP rating,as long as its not a sportjet will work on your mid, if you have the proper plate for it.But unless you do ALL of your own work,and are knowledgeable stick with a 225PM! Ya, you can find a little more power here and there, but time,cost,& effort IMO makes anything else a poor choice.

**Jrowe0831** · 01-05-2017, 11:43 AM

Ok so I can put any 2.5l 225 HP powerhead on my mid, then I will find a powerhead and maybe do an exhaust tuner. I hope the gains will be highly noticeable over my 200. Thanks for the help and information.

**rock** · 01-05-2017, 02:34 PM

The 225 Promax has to be one of Mercury's brightest spots. Very dependable and a very noticeable difference from a stock 200 and ideal for your application. Good luck and be safe.

Rock

**90 5.0** · 01-05-2017, 03:12 PM

The exhaust adapter ports on your 200 will be a little smaller than what came on a 225 promax, and the tuner is different too. Unless you are trying to race it won't hurt you that bad. I ran a 225 promax on a 200 adapter plate and tuner for quite a while, it would still spin over 7400 easily.

For or everylast bit of top end change the adapter plate to a 225 promax one and tuner but fishing on your nitro I doubt you'll be able to tell any difference.

A 225 promax actually makes 247-249hp from those that have dynoed stock ones.

**Jrowe0831** · 01-05-2017, 04:54 PM

Originally Posted by 90 5.0

The exhaust adapter ports on your 200 will be a little smaller than what came on a 225 promax, and the tuner is different too. Unless you are trying to race it won't hurt you that bad. I ran a 225 promax on a 200 adapter plate and tuner for quite a while, it would still spin over 7400 easily.

For or everylast bit of top end change the adapter plate to a 225 promax one and tuner but fishing on your nitro I doubt you'll be able to tell any difference.

A 225 promax actually makes 247-249hp from those that have dynoed stock ones.

Ok. Thanks for the help

**Slimm** · 01-06-2017, 10:27 AM

I think you can grind out the adapter to accommodate the larger exhaust passage of the PM, at least that is what I did. Took a little time and patience as I didn't have an air compressor to use my 'proper' tools so I was stuck with my 18v DeWalt drill and a couple rotary burrs.

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