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Why three mufflers, and which one(s) should I remove? Details; '74 Spider 2000, dual 40DCOE Webers, Euro Airbox/Intake (I'm not married to this and am open to switching to the standard style Webber dome filters), just looking for nicer sound and a bit more "go".

-Kristian
 

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The easiest, cheapest ,and the one that gives the most performance gain is to remove the rear muffler. The others are more like resonators and have little restriction. Centerline Alfa sells a replacement pipe, so you can save the muffler for the next owner:)
 

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George, how does that sound, will I terrorize my neighbors or just incite rice burners?
 

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Don't allow ourself to think removing an Alfa-designed cold air intake and "switching to the standard style Webber dome filters" will do anything to increase the engine's "go".
 

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I switched to a straight rear pipe a couple of months ago. Hardly noticed any difference in the noise or performance.
 

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Putting a straight pipe out back just gives it a bit more growl and only slightly more noise. Don't think it's much - if any - performance boost. The forward resonators give the engine the backpressure it needs to make good low-down torque. Probably the best thing you can do is a head job that includes big, lightweight valves and high-lift/duration cams for better breathing and a higher safe redline.
 

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I found my GTV was a lot louder, especially at the low end with a straight pipe replacing the rear muffler. About the same at higher rpm, but much throatier and deepier at idle and take-off rpms.

Andrew
 

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I Want my Burble Back

I just had a new NOS muffler train fit (after 38 years no less) and my nice growl/burble turned into a relative hum. Still smell the vaporized Castrol but it doesn't sound the same as a worn out muffler. Is the mounting of the Centerline unit straightforward? No home-made brackets?
 

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I've used several Centerline exhausts and they always fit pretty much fine. No home-made stuff ever needed.

Andrew
 

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:nods in agreement w/Andrew:

If you've got to fab something for the Centerline pipe, it's more likely an issue with your existing stuff, (something bent or hung funny further up), or the pipe got mangled in transit.
 

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Nah, the stock NOS set fit like a glove. I just wanted to know how much hassle it might be to fit in an aftermarket straight rear section if I chose to go that way. Sounds straightforward. I'll look around for someone nearby who has one installed and see how it sounds and put it on the wishlist. Lots of other stuff in front that really needs doing now.
 
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