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Hondata Honda Civic Type R - Tuner

An Educated Customer Is The Best Kind

Doug MacMillan
Feb 1, 2009
Turp_0902_01_z+honda_civic_type_r_tuning+doug_macmillan Photo 1/1   |   Hondata Honda Civic Type R - Tuner

Many advertised products fill the pages of this magazine. Many of them work well,but some of them do not.

For example, I've seen many cat-backs that are noisier and make less power than stock ones. A poorly designed, overly restrictive exhaust effects pretty much every other performance part you add to an engine. So, the question is, how do you know before you buy?

2019 Honda Civic
$21,450 Base Model (MSRP) MPG Fuel Economy

When tuning a Civic Type R in England with Toda cams and a Toda header, I started off with a program I developed for an RSX with identical cams and Toda headers using a Brand X exhaust. This Type R, however, lost 25 lb-ft of torque immediately after the 4,000 VTEC crossover point, and no amount of tuning could fix it. So I consulted my proctology notes, extracted the dyno's tailpipe O2 sensor, and took a look. What I saw was a great example of how not-to build a rear muffler. The internal diameter of the rear muffler was only about 1.5 square inches. A quick swap to a spare cat-back immediately recovered our lost 25 lb-ft of midrange torque and added 20 peak horsepower to boot.

So next time you're shopping for a cat-back, take a look past the 10-square-inch tip and look deep into the internal section. If you see a pipe significantly smaller than the entry pipe, you are very likely to lose power.-Doug Macmillan of Hondata

By Doug MacMillan
6 Articles

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