Originally Posted by Zippy

I was fortunate to have Stef & Herman at Europipe make me a custom "Bazooka". Steff prefers to call it a "Prototype"

The exhaust has the newest 100 cell racing cats. 70mm & 76mm tips. Light weight internals. Airflow, measured on a SuperflowSF-600 @ 20" H2O = 588 cfm. New "Prototype" backpressure on a stock 996TT at 6500 RPM = 0.080 bar. Backpressure with stock exhaust = 0.36 bar.

Originally Posted by Zippy

It weighs approx. the same as stock

Originally Posted by jags911tt

Are you serious!

Originally Posted by Zippy

Yes. Bit it has 1/4 the backpressure as stock & 2.7x the air flow @ 20" H20. It's obviously a lot different, in may ways, than the simple tube type exhaust systems.

Originally Posted by Zippy

No I didn't. The car sounds about 200HP better though!

Originally Posted by Zippy

I'll get 1 for you.

Originally Posted by MidnighTT

I'm always amazed by how much disinformation there is on the web. If found these same paragraphs that Sallymobile posted, well, almost the same, on another site:

http://www.silveradoss.com/forums/lo...t20662-50.html (scroll down to the 4th post)

Here's the relevant snippet from that page:

"MagnaFlow Performance Exhaust METALLIC-CAT catalytic converters.

Ok here's the scoop. We have just wrapped up categorization and part numbering for both emissions compliant and race part offerings.

MAGNAFLOW PERFORMANCE EXHAUST METALLIC-CAT
59920 Series – ULTRA High-Flow Performance Catalyst (Center / Center)
Highest flowing catalyst available. 59929 was tested (1000 cfm range @ 28" of H2O) to flow ~600 CFM. The one piece spun body long neck design and 400 cell density metal composite core make for the best flowing catalyst while providing compact packaging and extreme durability.

MAGNAFLOW PERFORMANCE EXHAUST METALLIC-CAT
59950 Series – Compact High-Flow Performance Catalyst (Center / Center)
High flowing compact packaging catalyst. 59959 was tested (1000 cfm range @ 28" of H2O) to flow ~570 CFM. The one piece spun body short neck design and 400 cell density metal composite core make for excellet flow and extreme durability. The compact series uses all the same features as the ultra high-flow but provides for SMALLEST packaging avialable in high performance cats."

Note that the data Sallymobile found claims these cats are 200 cells per square inch, but the claim on the site I found this morning is 400 cells per square inch. Add to that the fact that the phone tech told me they are 300 cells per square inch.

Note further that both of these quotes (that sure sound like they came straight from the manufacturer) contain the same typo in the last sentence (avialable).

Sallymobile, please don't take this as a slam at you, I think you were just posting what you found.

The engine builder (and friend) who did my supercharged Camaro engine has a Superflow flow bench, I'm seriously tempted to buy a few different cats and have him flow them at the same pressure setting.

Jeff

Originally Posted by SallyMobile

I believe they're 300 cell.