removing restrictor inside the muffler

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spreefreak
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removing restrictor inside the muffler

Post by spreefreak »

how do i remove the restrictor inside the muffler of an Iowa spree.
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vette76
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Post by vette76 »

its in the head pipe inside the header flange. pull off the exhaust and either find a step bit or a dremel and drill out the washer so it is the same dia. as the pipe.
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Post by spreefreak »

would you have step by step instructions, I'm new at this
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Post by burnt_toast »

1. take off muffler (easy enough)
2. drill out washer to deristrict muffler
3. install muffler back on.

there ya go. :wink:
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spreefreak
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Post by spreefreak »

but do i need to change the jet?
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Post by burnt_toast »

spreefreak wrote:but do i need to change the jet?
I don't think you do, stock jet should be able to do unrestricted.
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Post by noiseguy »

No, don't rejet. It should be a #65 for stock intake and exhaust (Iowa or not.)
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Post by spreefreak »

Great
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Post by spreefreak »

does the restrictor look like a washer or what? is at the opening of the muffler when you take it off?
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Post by vette76 »

yes looks like a washer. about a 1/4" hole that should be a 1" hole. u will see it when exhaust is removed.
00' sa-50 slammed and stretched
89' elite sb, with a 99' af16, (SOLD)
87' spree (SOLD
87' mustang gt vert kenne bell, irs.
90' mustang notch turbo drag car
12' wrx
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Post by kwosha »

just curious when reading this.....does anyone know if there is a restrictor on the 1983 Aero 50 (NB50M)??

thanks
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Post by noiseguy »

Not that we're aware of. This is a regulation item on Spree "Iowa" editions.
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spreefreak
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Post by spreefreak »

yes it is i will probably do this soon let everyone know
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Post by spreefreak »

didnt drill out the restrictor but cleaned the carb and went from 15 mph to 25 mph, which is a great improvment in my eyes. I have only put about $100 - $110 into it since I got it from my uncle who was gonna throw it away. It rocks!!!! I'm thinking about painting it any suggestions on the color it is Red right now its the original color.
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Re: removing restrictor inside the muffler

Post by Rowbear »

I have an Iowa spree that tops out in the low 20s with me on it (175lbs) and around 26 with my wife. I took the muffler off while ago to see the restrictor but I'm not sure I know what you guys are talking about. There is a washer type piece that allows the muffler pipe to form a seal with the flange piece from the engine and that comes out, but that wouldn't restrict flow since it fits around the muffler pipe. Other than that I don't see anything that looks like a washer. Then inside the flange it just kind of funnels down to a small (maybe 1/4' opening). Is this funneling type piece the restrictor? How do you drill that out since the frame is in the way? Anyone got a picture?
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