airmass long tube header.. I don't know if they still make them or not..
that's your answer..
more torque is better..
with the 420a however.. the gains are to be had in the cylinder itself and in the head... the exhaust ISNT the problem..
you can bolt on everysingle header to your hearts content.. and they'll all be within a few hp of each other.. BUT your low end torque will go all to crap.
airmass.. or stepmatch the exhaust flange on the cast manifold and open up the output to the downpipe to 2.5"..
nothing you can bolt on will be better..
the intake manifold is where all the gains are to be had.. and in the head itself.. it is the problem.. it's upside backwards and down.. not to mention castings shifts in the head that don't lend themselves to "awesomeness".
btw.. port matching.. making everything the same size and to flow smoothly.. looks good until it slams into the cat.. and you have a reversion wave travelling backwards up the exhaust to the head.. step match that biatch..
http://hytechexhaust.comHyTech has been the leader in race engine exhaust technology for the past 21 years, with numerous championships in SCCA, USAC, Trans-Am, World SportsCars, Dirt Track and NHRA Drag racing series. HyTech's innovative approach to exhaust development has catapulted it into the forefront of the racing industry.
HyTech incorporates ANTI-REVERSION ® patent 6,336,471, stepped pipes and sequential cylinder pairing into all of its exhaust systems.
HyTech began designing and manufacturing exhaust systems in 1984 with the introduction of its anti-reversion header for popular Formula Fords. Since then with the help of numerous engine builders from all aspects of racing HyTech has gone to dominate the SCCA road racing series with the Formula Fords, Formula 2000, SP 2000, and Toyota Atlantic Series.
By the early 1990's HyTech moved into several other venues of racing, like NASCAR Late Model Circle track and USAC midget series. HyTech has developed the exhaust for the Esslinger Engineering Midget program which is now the dominate engine in the series. HyTech has also dominated the Cart Toyota Atlantic series for the last 3 years with its highly developed Three step anti-reversion tri-y system. HyTech has also dominated Import Drag racing series with clients like Stephan Papadakis, Brent Rau, Skunk 2, Jeremy Lookofsky, and Mark Brauning.
HyTech's innovative approach to exhaust design has set us apart from the competition. With 21 years of experience in exhaust technology and the implication of anti-reversion chambers, stepped primary pipe configuration, tri-y collectors, acoustical tuning, sequential cylinder pairing and non conventional pipe shapes. We are able to forge new territory in exhaust design.
It is all about acceleration or "Transient Response" as we call it. Which is how fast a particular engine will transient from its lowest rpm to its highest. And the exhaust has a major effect on how that happens. When the exhaust is designed right it will greatly influence the transient response time.
then go read this..
http://www.theoldone.com/articles/Larryscivic/Larrys_Civic.htm on the proper way to build an engine..
infact read EVERYTHING at theoldone.com
and then scratch your head and read it again.. 250hp daily driver naturally aspirated 2L is nothing to sneeze at.. even if it's a honda motor... and no reason our engine can't do the same thing.. except people haven't invested the time nor done the proper research.. just bolt excrement on and toss money at it in an attempt to find the magic needle in a haystack configuration of parts that might sorta work.
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