i'm looking at the hushpower resinator i want to run, and i have these two options
12512300 Hushpower HP-2 "Shorty", 2.50" IN/OUT, 304S
Hushpower HP-2 "Shorty", 2.50" IN/OUT, 4.00" x 5.50" x 12.00", 304S
$143.35
12512400 Hushpower HP-2 "Shorty", 2.50" IN/OUT, 409S
Hushpower HP-2 "Shorty", 2.50" IN/OUT, 4.00" x 5.50" x 12.00", 409S
$112.40
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The 304S is more expensive than the 409S... i assume this is difference between the quality of the stainless steel, but what are the real differences (like in terms of rust/longevity, etc)
I'm surprised they offer two different SS's. In general, 400 series is magnetic (it's not a magnet, but if you bring a magnet next to it it will stick) and is also hardenable. It doesn't really have anything to do with the quality. There are slight differences in heat cycling and strength as well, but it shouldn't make a difference in this case. Email them and ask them why they offer two?
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- Sold my beloved J in April 2010 -
your 409 is going to rust where the 304 is less prone to rusting.
R.I.P. Brian Klocke, you will never be forgotten
409 surface tends to oxidize easier taking on a darker color and therefore appears "rusty" over time, but it doesn't penetrate through like mild steel. I actually just looked at my exhaust, and the 304 resonator looks just as "rusty" as my 409 pipes. If you are concerned with a show-quality finish, go with 304. Otherwise, it really doesn't matter.
I have no signiture
409 is what a lot of stock cars use - it should have no problem going 100,000 miles. It just won't look as pretty as 304 or 316 when it comes out of the box, as already mentioned.
i went with 304... although i'm running mild steel piping, i plan to powder coat/ceramic coat the piping after my welder has welded up the flanges and hangers, unless thats a bad idea... (ive never heard of anyone powdercoating past the header)
absolutely ceramic coat the whole works man. its often a missed step, especially around here....
180hp in 1989 or 145hp in 2002, you decide. >
If you don't want to spend a ton of money you could always do the anti sieze coating. My next exhaust is going to be mild steel and anti sieze coated.
i don't live in the salt belt... but i figure it would be a good precaution
BuiltNBoosted wrote:If you don't want to spend a ton of money you could always do the anti sieze coating. My next exhaust is going to be mild steel and anti sieze coated.
What is this anti-seize coating you're talking about?
I've never heard of this and I'm curious since I've got a mild steel exhaust system on the car.
Thanks.
Misnblu.com
Newbie member since 1999
Thank you Dave and JBO! 
I used high temp engine enamel on my exhaust and it has been on for several years (well sections of it as others have been replaced by other bits to quiet it down) without any rust issues. Dont need to use that messy ass anti sieze if you use a quality high temp paint.
