New build 454 and the wife hates the exhaust smell

Tonimus said:

How long have you been running the sniper? Takes a little bit for Holley systems to lean out since fatter is generally safer. You could throw a smaller tune at it as well. Tell the unit it's a 396 or something.

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DoubleDingo said:

It will, and there are threads on the subject if you do some searching

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txaggie said:

Thanks. Do you have a recommendation on any brands?

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txaggie said:

Let me know if anyone has any recommendations!

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3 Ton said:

Dump the Chinese made Holley crap, some of them work, some do not. Why take the chance.
i had one client that both Mom, Dad, and he installed Holley crap on all 3 trucks. They had to go back to a carb because one would not work right.

BTW I did carburation parts before I retired. Holley went out of business the same time Carter and Rochester were forced out of business. Everything NEW is from China, and its all junk. Any of these names on new carbs are Chinese made. 100%

Where do your tail pipes end up? Blowing exhaust back into he cabin is usually on how far back they go.
You have not stated if its leaking form the pipes OR coming form outside in.

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txaggie said:

Howdy all!

I recently rebuilt an 85 suburban 454 and stripped the factory exhaust off for a hooker black heart 2.5” x pipe dual system. Well, my lovely wife hates the exhaust smell and I was curious if some high flow cats might cut down on it?

Let me know if anyone has any recommendations! 454 bored .030 over, Holley sniper, long tubes, etc.

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Bextreme04 said:

The answer is yes, cats will absolutely reduce the smell. I have dual 3" Flowmaster high flow cats on my 2011 Burb and still get a small bit of exhaust smell because they aren't enough for a slightly angry 6.2L. You don't have any need for a high flow cat on your application. Modern federal legal cats are not going to restrict exhaust flow at all and will only be beneficial. I had to use the high flow because the design of the Y-pipe in my application did not have room for regular cats once the long tube headers were put in. A dual exhaust on a squarebody should have plenty of room for regular cats. Do you have headers on it? If so, you can just weld the header flange right on one side of a universal cat. If using regular manifolds you will need to have it worked to get the cats as close to the manifold output flanges as possible.

2 of these are exactly what you need and would even have free shipping. You'd be all-in for less than $200.
https://www.flowmastermufflers.com/...QVSu_YJf5ioXSwX3bXqH3XjtDHGURXY8aAhC4EALw_wcB

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Matt69olds said:

Find someone who can tune the system for you. The self tuning will get it close, having it custom tuned will make a world of difference.

Having said that, I’d consider using the matching distributor and using the sniper for timing control also.

Hope you don’t have any issues with your sniper. It’s safe to say holleys quality control leaves much to be desired.

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Matt69olds said:

Find someone who can tune the system for you. The self tuning will get it close, having it custom tuned will make a world of difference.

Having said that, I’d consider using the matching distributor and using the sniper for timing control also.

Hope you don’t have any issues with your sniper. It’s safe to say holleys quality control leaves much to be desired.

Click to expand...