View Single Post
RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
RarlyL8's Avatar
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,523
Merve - in your situation I would find a way to transition the headers. Is the flange thick enough to machine a shallow transition?

To get big power out of these engines you need flow. Any bottleneck or mis-match will be less than optimal. You may not feel it but you are leaving something on the table.

If you are targetting throttle response or reduced lag then smaller primaries will promote greater velocity at the cost of top end power.

Do you have a copy of Corky Bell's book? Great explaination of how this works and how to design an optimal exhaust system for your needs.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-31-2007, 06:53 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)