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I'm sure you could come up with something that would work on single in/single-out systems; an example is the muffler (FR500?) offered by Ford's SVT for Mustangs. The valve that varies backpressure is inside the muffler. I seriously doubt that muffler would work on any Corvettes, designed as...

Sorry I didn't really answer most of your questions in my last post, so here goes: 1. The best way to reduce interior temperatures with a free-flowing exhaust is to space the pipes farther away from the body! :) Backpressure does not have much effect on exhaust gas temperature, within the...

I've done better than that: I've seen the flow curves for air injection pumps, and they consume a maximum of about one horspower or slightly more AT MAXIMUM FLOW. And they don't work all the time, so the power loss is variable. I don't recall the control logic though. So restricting the...

Driving around town yesterday, just about the time the aux cooling fan gave up, my brake pedal starting getting softer and traveling farther, until finally the "Brakes!" light came on. Checked the fluid reservoirs, and both are full, no signs of leakage onto a wheel, so I'm certain I've...

Unburned or excess fuel will destroy your cats, since what they're trying to do is to "burn" the unburned fuel, so they'll get so hot that the ceramic honeycomb "substrate" melts down and/or breaks up. When this mess gets stuck in your pipes, you've got the recipe for major power loss; if...

Take a look at another concept for the "dual-mode muffler'. Arvin's Japanese partner brought an idea for a muffler where exhaust pressure opens an internal throttle valve against spring pressure trying to close it. Come to find out, F*rd offers something like this as an aftermarket (SVO?)...

And I just replied to it; but I'll answer here anyway. You can compare the two replies and see if they match. :) While I don't think I have any data on this, my best guess is that the mufflers are more restrictive than the resonator. The resonator, although it has rather small internal...

NO! NO! Not a router! Jigsaw with a metal-cutting blade is pretty mandatory, add a Dremel tool if you just feel the need to buy tools; otherwise use a file to knock off the sharp edges that WILL snag you. Take your time, wear leather gloves, ear plugs to stop that awful screeching noise...

GM went with that muffler layout because it was the closest thing to a logical choice available to them, since the "vehicle" engineers had cleverly completed a body/chassis layout that left only that location for mufflers. The single most important design criterion being, of course, that the...

It depends on many factors, including the type vehicle - generally, you'd spend more time on a Cadillac than you would on a Cavalier - but it also depends on what your relationship is with the customer, and how much experience you have with a particular model. Since a typical new vehicle...

BWAHAHAhahahaha..... Oops, excuse me! Sometimes I just... Anyway: The short answer is: GM gets all their exhaust system work done by suppliers. (There are at best one or two engineers at GM that actually have a corner of a clue as to how exhaust systems work - and I'm speculating here; I...

Could be.

Of course it's hot; this is North Texas, where an average summer day will be over 100 F, from early June through late September. This year excepted. I think yesterday was our first day over 100. Anyway, the only difference between one alternator and another - all Delco rebuilds, BTW - is how...

Apparently it's "normal" enough that JC Whitney has introduced a fix for it and that various auto-supply chains like AutoZone have introduced extra-cost "Lifetime" guarantee replacements. The diodes fry in mine; replacing them is a pain, so I just go with the Delco replacements. $179 at the...

If you're bottoming out on the first bump, you need stiffer springs. To keep things under control, then you'd also need somewhat stiffer shocks. If you're getting a lot of motion from a first bump, then coming down hard and bottoming out on the second bump, then you could fix the problem...

They sound like fun; my wife wants one too, but we live in North Texas, where the "standard" family car is the Chevy Suburban, and an Expedition is considered to be a compact SUV! :( I'm not sure a Mini even shows up on a Suburban's radar screen.

________________________________________________ Redbob here! You're both right: The calculations that I did (back around '92), and the space available, dictated the crossover pipe location just where the LT4 cars, and the Export cars, have it. Theory says that location should work, and my...

Re: Oh yeah??? Chrysler product. 'Nuff said! Oh, and having worked at Chrysler, for a few years, I think I'm qualified to comment. But as to "How long will it last?" The answers are all above: 1) Religiously maintain it; and 2) Abuse it all you can afford! My C4 has 112,000 on it...

Tom: You're welcome. But the key question is: "How did it sound?" "Powerful"? "Expensive"? "Solid"? "Tinny"? (Probably not!) This is the kind of question you'd ask of a jury evaluating sound quality. And how does it compare to a Corvette? Best Regards, Robert

Tom: As a vehicle acoustics engineer, and one who has worked on the C4 and C5's, I can tell you that the answer is not that simple. Without the test results in front of me, I can't give you a direct answer, but I can say this: First, unless the noise testing is done under exactly the same...