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As far as automotive great ideas that go away and come back, this has to rate up there with the 58 Ford retractable. In today's market, there are literally thousands of cars and trucks driving around with some type of 'push a button-quiet to loud' exhaust. The fact that the idea was put...

Magnaflow mufflers do not have baffles. They have a tube with perforated holes and a lot of 'matting' packed in there for sound deadening. If a piece of the tubing inside broke, it's possible that some of the matting has deteriorated or disintegrated over time. That could account for the...

In tests that we performed on a 3" X, we got more horse power when running an X pipe and dumps than open headers! However, as you get into higher hp applications, some tests we've read show a declining advantage of the X. If you are running 10.60's, I think you are still in a...

Hey thanks for reaching out! Doing a Dart with a big motor like that opens up a lot of decision making. how about if you call our toll free # and talk to Kyle. Make sure you mention the A-Body forums for a discount. 844-MAX PERF

As you can see by all the various qualified but confusing comments, this whole issue is a sh$%t show. By EPA guidelines, if we wanted to create a CARB approved converter to sell in California or NY, we'd have to design it to fit in the same way the original did. That means no welding...

I'm not sure what you mean by 'exempt' but the EPA made it very clear to us that anything newer than 1974 requires a converter that is equal to our better than whatever was on the vehicle originally. I'm referring to the sale of any type of aftermarket catalytic defeat devices....which could be...

I have no idea why I put 'except in California'. :( Well that's embarrassing. I apologize to viewers. I might have been thinking about the original 1967 EPA requirements. ie smog pumps and the grey area of wording that accompanied those initial requirements between then and 1975...

By 1975, all passenger cars by Federal EPA standards, had to have a catalytic converter exhaust system. Since this standard was just being put in place, it's entirely possible that some early production vehicles got some type of special exception? super early production 1975 models? If...

ok, you are from CA and obviously have good experience in that state. The topic starter wants to buy a post 1974 vehicle and is seeking our advice. So if CA is so incredibly emissions conscious and any modification to the catalytic converter is considered 'tampering', is everything controlled...

ok, egg on my face. It is 1974 and prior. but not sure whether the topic starter understands what was right and wrong about my statement. If he is looking at buying a 1974 car, then I gave bad advice. Any other year besides 1974, and my advice is accurate. :) Maybe I blocked those 2...

By 1975, all passenger vehicles would have had a catalytic converter by federal EPA law. That doesn't mean some states allowed vehicles without converters to still be sold. But what is more important is your original question. I'm not aware of any state that can prohibit you from...

We dealt with an EPA audit for a 2 year period while they dissected all of our exhaust products. We paid the nations top emissions lawyers a lot of money to help us during this time. Not to sound like a complete JA but what experience do you have with the EPA with respect to emissions?

If your car is 1973 or older, you do not need to add cats to your car except in California. If your car is 1974 or newer, it all depends on what state you live in as to that states requirements for emmissions but at the same time, federal law prohibits the use of a 1974 and newer vehicle...

All good recommendations here for the topic starter. The only thing I see time and time again is that newly rebuilt motors seem to always run hotter. Maybe it's the aftermarket components? The change in fuel requirement? the Cam? Anyway, if the topic starter has a good original...

A 22" radiator with a built motor and AC should get the maximum cooling available. That is dual 1 1/4" tubes. All other options fall short. AS I have said in the past, the smaller volume radiators may get the job done, others will say they have had success, but what it runs hot after...

factory shroud does not fit this radiator. We tested it.

Agree! There can be a big difference in cfm with a straight through muffler vs a chambered or turbo type muffler especially if you are racing the car and trying to get every single HP you can possibly get. That being said, for everyone reading, the pipes have a much greater affect on...

The 440 is a pretty big motor. Probably built up bigger than anything that Mopar had to offer back in the 60's or 70's. So while I do agree that the OEM radiator can get the job done, it is likely pushing 50 years old and you might not want to push that old radiator to it's physical limits...

It's not so much the size as the type of bending. Mandrel bent tubing will have significant performance gains. Since it's quite rare to see 2" mandrel bent exhaust, you will be looking at 2.5" for your application. An very common example of a 2" crimp (oem style) bent system...

Love to have you get a pair of our mufflers but if the Dynomax super turbo's gave you drone, the Pypes super turbo's will give you very similar drone. Internally, they are very much the same design. Things to check: 1. Make sure the exhaust system is insulated from the body of the...

You are correct.

The OER radiator is a good brand. When we were in the GTO parts business, we sold them for years. btw, The copper brass model is USA made. The aluminum version is not.

It was late at night when I posted and I was a little tired and irritated that our brand was being unfairly 'bashed'. I apologize for the way I handled the question posed by SLEYNG. That being said, I am not a liar ad I'm not trying to hide anything. I have run several very successful...

WOW! That's a lot of verbiage for someone who is just asking a simple question lol! Your first question took a paragraph and after I answered it with a paragraph, now here's another paragraph response when the answer is already pretty clear and if not, really doesn't matter does it? If...

ok, bummer. Is it a matter of elongating the hole or is the hole in a completely different spot? You can also return it if you don't want to do the extra hole. We can do a call tag and pick it up.

Not true. We have a 60 day return policy that includes fitment. Basically, as long as you don't stick a screwdriver through the core, it's returnable for an exchange or refund. We also have a lifetime warranty...not prorated. New replacement if it ever fails.

Our rads are not made in the USA. That being said, we have 30 American workers in Hatfield PA of which a lot of them are car enthusiasts. We do all the product development, testing, tech support, marketing etc in Hatfield. Not to make excuses, not to beat this subject to death and...

ok, now I understand. I was personally involved with development of the A body unit. The owner is a member here on the forums. I saw how it fit. He was extremely pleased with the fitment. No mods required. That being said, it's possible a production run mistake was made? Can I ask...

Did you test fit the radiator or are you seeing that the brackets look different and thinking there is a problem? The big plus on this unit besides fitting the firewall is that the OEM shroud fits the other side without mods.