Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > 5th Gen Honda Prelude

Thread Title
Size for a high flow.

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 02-23-2009, 03:45 AM
I'm New
 
Join Date: Oct 2008
Posts: 5
iTrader: (0)
djblu3 is on a distinguished road
Size for a high flow.

Thinking about getting a Carsound or Random Tech high flow cat. What diameter size gives the best performance?

I have a stock header and I believe its about 1.75 in. at the down pipe that connects to the cat.
Reply With Quote
  #2 (permalink)  
Old 02-23-2009, 04:09 AM
98BB6SH's Avatar
JDM That Ho!!

ROTM!
 
Join Date: Apr 2008
Location: NYPOC
Posts: 4,440
iTrader: (12)
98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute98BB6SH has a reputation beyond repute
Send a message via AIM to 98BB6SH
Re: Size for a high flow.

the inlet should be 1.75 and i believe outlet is 2.25 or 2. too tired to remember. if someone doesnt' answer by the am i'll repost.
__________________
NYPOC
-New York Prelude Owner's Club-
Admin
__________________________
2006 Ducati Monster S2R
2003 Mitsubishi Galant - Daily Driver
2002 Lexus IS300 - Sold
1998 Type SH 5th Gen - Sold
2001 EBP 5th Gen - Wrecked

Click The Links Above For Pics
Reply With Quote
  #3 (permalink)  
Old 02-23-2009, 01:11 PM
Junior Member
 
Join Date: May 2008
Posts: 70
iTrader: (0)
Storm_Rider is on a distinguished road
Re: Size for a high flow.

there's no one size that is best performance. it depends what rpm range you are looking to target because your exhaust as a whole works towards that goal and determines what size pipping you have to use.

since you have a stock header and down pipe, then your cat's inlet will have to match the size outlet on the down pipe. could be slightly larger i guess but nothing more than half an inch. (pulled that number out of thin air). and if you have a stock exhaust,the cat's outlet will need to match the inlet size of your exhaust's A pipe or whatever it's called.

it's more tricky picking the right exhaust size than picking the right cat size. it's been debated too long about how much increase in air flow a high flow actually gives you. the argument is that the high flow's honey comb thing inside still restricts flow and is not that much better than the stock cat when compared to using a test pipe. but that's obvious because a test pipe has nothing in it.

if you don't have an aftermarket exhaust, i'd recommend you invest in that before you invest in the cat.
Reply With Quote
  #4 (permalink)  
Old 02-23-2009, 04:59 PM
I'm New
 
Join Date: Oct 2008
Posts: 5
iTrader: (0)
djblu3 is on a distinguished road
Re: Size for a high flow.

Actually, if it only makes a small difference I'd probably consider getting a regular cat instead of a highflow. Only reason why I was looking into the high flow is because honda wanted almost 500 bucks to get oem cat. I searched online and saw high flows for under 150.

The only question is, which cat will be a direct bolt on if I have a original header and original exhaust?
Reply With Quote
  #5 (permalink)  
Old 02-24-2009, 02:28 AM
I'm New
 
Join Date: Oct 2008
Posts: 5
iTrader: (0)
djblu3 is on a distinguished road
Re: Size for a high flow.

\http://cgi.ebay.com/ebaymotors/CATAL...31112007r19062

This will fit my 98 base lude with out any modifications to the header and exhaust right?
Reply With Quote
  #6 (permalink)  
Old 02-25-2009, 09:32 AM
akaprepreludesh's Avatar
Silver Member
ROTY `10!
ROTM!
 
Join Date: Feb 2009
Location: Colorado Springs
Posts: 382
iTrader: (0)
akaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond reputeakaprepreludesh has a reputation beyond repute
Re: Size for a high flow.

I used to have a Random Technology Cat with my DC sports headers and Greddy Evo2 Exhaust. I really want to say that the inlet and outlet sizes were 2.25" inlet and 2.5" outlet. I believe they were going more for the aftermarket crowd who's bolt on exhaust would almost meet or exactly match the outlet size.

Regardless, just because the outlet size diameter doesn't sound like it's going to fit the stock exhaust, it will because the flanges all bolt right up. It'll leave room for performance exhaust upgrades in the future, too!

I also passed a Texas State Emissions test with the Cat on too, that might be helpful to know depending on the area you live in.

Also, with it being Stainless Steel, the thing was very nice looking when I took it off, no rust, just discoloration and a little dirty.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hi flow CAT orbslude 5th Gen Honda Prelude 1 02-05-2009 12:23 AM
Hi-flow cat OneRedLude General Tech Talk 10 09-09-2008 07:53 PM
high flow cat ninety3lude General Tech Talk 40 02-16-2008 09:17 PM
High Flow Cat Pooponurhead General Tech Talk 4 10-15-2007 12:21 AM


All times are GMT -4. The time now is 08:01 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.