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#1
01-20-2010, 11:02 PM
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Hi flo metalic vs normal ceramic catalytic converter?
Greetings All,
Searched the exhaust forums but did not find an answer. Whats the diff between the "hi-flo" Metallic substrate catalytic converters and the standard ceramic substrate? I have a Pypes 2.5" X-pipe system I will be installing soon. I am putting dual cats on it and I just want to know if it worth the extra expense to use the hi-flo metallic substrate. The old system is a 2.25" H-pipe with dual cermic substrate cats. Are hi flo cats any use on a street only car?
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1977 TA 400 9.5:1 CR 351hp 414LbFt, #13 Heads + 1.52 Roller rockers, 1968 Pontiac 400 intake, Holley 4165 650 DP #7054 Howards Hyd .447/.467 IN:288 EX:298 214/224@.050, MSD6A + MSD timing control + H2o/Meth 1-5/8" headers, Magnaflow 200CPI Cats + 2.5" Pypes X, Dynomax STs, TH-700R4 2200 stall, 3.42 Eaton 10-bolt, PS/PB/PW/PL/AC/Cruise 13.84@100.14mph 2.18 60' on P255-60-R15 radials, pump gas, mpg : 21.5 hwy 15.2 city 
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#2
01-21-2010, 03:51 PM
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Any opinions on Pypes CVM11K 2½" Highflo Mini-Cat w/ Metallic substrate Kit ?
Any thoughts appreciated.....
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1977 TA 400 9.5:1 CR 351hp 414LbFt, #13 Heads + 1.52 Roller rockers, 1968 Pontiac 400 intake, Holley 4165 650 DP #7054 Howards Hyd .447/.467 IN:288 EX:298 214/224@.050, MSD6A + MSD timing control + H2o/Meth 1-5/8" headers, Magnaflow 200CPI Cats + 2.5" Pypes X, Dynomax STs, TH-700R4 2200 stall, 3.42 Eaton 10-bolt, PS/PB/PW/PL/AC/Cruise 13.84@100.14mph 2.18 60' on P255-60-R15 radials, pump gas, mpg : 21.5 hwy 15.2 city
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