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The Terminator
Exhaust
Does a 3" catback really make any difference over a 2.5"?
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<blockquote data-quote="stangfreak" data-source="post: 14560649" data-attributes="member: 10655"><p>I remember back in the day two of my buddies were building up there cobras. Both had stroker motors, same cams, same ported heads, everything. The only difference one car had the 2.8h kb the other had a 3.4 whipple. same shop same tuner. </p><p></p><p>The 2.8 kb car had regular mac headers, prochamber, and a 2.5 inch magnaflow catback. The 3.4 whipple car had a custom 3 inch exhaust system built by american racing headers. custom. 3 inch all the way even catback.</p><p></p><p>The 2.8 kb car was right on par with the 3.4 whipple cobra. The whipple car probably made a few more hp because he was running more boost than the 2.8. we saw nothing crazy. ARH does recommend 1 7/8 long tubes with a 3inch collector, to a 3 inch midpipe which tapers down to a 2.5 at the end. This is with high boosted big blowers cars. </p><p></p><p>so my guess is, the power is coming from the headers and midpipe.</p></blockquote><p></p>
[QUOTE="stangfreak, post: 14560649, member: 10655"] I remember back in the day two of my buddies were building up there cobras. Both had stroker motors, same cams, same ported heads, everything. The only difference one car had the 2.8h kb the other had a 3.4 whipple. same shop same tuner. The 2.8 kb car had regular mac headers, prochamber, and a 2.5 inch magnaflow catback. The 3.4 whipple car had a custom 3 inch exhaust system built by american racing headers. custom. 3 inch all the way even catback. The 2.8 kb car was right on par with the 3.4 whipple cobra. The whipple car probably made a few more hp because he was running more boost than the 2.8. we saw nothing crazy. ARH does recommend 1 7/8 long tubes with a 3inch collector, to a 3 inch midpipe which tapers down to a 2.5 at the end. This is with high boosted big blowers cars. so my guess is, the power is coming from the headers and midpipe. [/QUOTE]
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Does a 3" catback really make any difference over a 2.5"?
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